Monster Cookies – My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M’s makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they’ll become a family FAVORITE in no time! 

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 

Monster Cookies Recipe

I remember growing up with monster cookies and to this day, I am a sucker for any type of cookie with oatmeal, peanut butter, and chocolate chips!

Oh, the M&M’s, toffee bits, and shredded coconut don’t hurt. They all help to make these easy monster cookies soft, very chewy, and impossible to resist.

These cookies are a family-favorite treat for any type of casual get-together or party or as a just-because type of cookie when you’re craving a fast and easy sweet treat.

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 

This classic monster cookie recipe is always a favorite for cookie exchanges because it makes a pretty big batch of cookies and they’re not fussy to make.

To make them more festive for the holidays, you can always add red and green M&M’s or sprinkles and you’re set!  Keep reading for more ways to customize this very simple cookie recipe.

And for all you monster cookie fans, be sure to check out my 2013 recipe for Triple Cookie Monster Cookie Bars. Faster and easier than making cookies and it’s been a crowd favorite for nearly a decade!

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 

Ingredients in Easy Monster Cookies

To make these family-favorite classic monster cookies, you’ll need the following very common fridge and pantry ingredients including the following:

  • Granulated sugar
  • Light brown sugar
  • Creamy peanut butter
  • Unsalted butter
  • Vanilla extract
  • Large eggs
  • Quick 1-minute oats
  • All-purpose flour
  • Baking soda
  • Salt
  • M&M’s
  • Mini chocolate chips
  • Toffee bits
  • Sweetened shredded coconut

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 

For a more complete ingredient list with amounts, scroll down to the recipe card section of the post.

How to Make The Best Monster Cookies

Making monster cookies is a cinch! Follow my very easy and straightforward directions for the best tasting monster cookies:

Step 1: In a stand mixer or electric handheld mixer, beat together the sugars, butter, peanut butter, and vanilla until smooth.

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 

Step 2: Add the eggs one at a time.

Step 3: Slowly add the oats, flour, baking soda, salt, and beat to combine.

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 

Step 4: Add the M&M’s, toffee bits, chocolate chips, coconut, and beat to incorporate.

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 

Step 5: Use a medium cookie scoop to form cookie dough balls and chill the dough.

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 

Step 6: Preheat your oven to 350F, bake the cookies on a Silpat mat or parchment lined baking sheet, allow them to cool a bit, and then dive in! 

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 

What Kind of Oats Should I Use in Monster Cookies?

For these soft and chewy monster cookies, I use Quaker Quick 1-Minute Oats.

I like using quick-cook style oats because it gives them a bit of texture but not as much as if you were to use old-fashioned whole grain oats.

Plus the finer texture of quick-cook minute oats helps bind the dough together so you use less flour overall.

If all you have on hand are old-fashioned whole grain oats, pulse them a couple of times in your food processor to break them down into a finer, more powdery texture.

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 

What’s Type of Peanut Butter is Best in Monster Cookies?

When I bake, I always use a processed peanut butter like creamy Jif or Skippy. 

I don’t recommend using natural peanut butter or any type of peanut butter than can separate in your monster cookies recipe because sometimes it doesn’t survive the baking process well and your cookies may spread too much.

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 

Do I Have to Use Coconut in Easy Monster Cookies?

We adore the flavor of a bit of shredded coconut but if you don’t, you don’t have to use coconut. 

It’s only 1/2 cup in the entire recipe so to make up for it if you’re not going to use it, simply add about 1/3 cup additional 1-minute oats, or add additional M&M’s or toffee bits.

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 

Substitution Ideas and Add-Ins for Monster Cookies

Monster cookies are one of my favorite types of cookies to help clean out my pantry and baking cabinet! 

Feel free to toss in 1/2 cup of any of the following add-ins if y0u’d like and scale back the amount of M&M’s by 1/2 cup:

  • Milk chocolate chips, peanut butter chips, white chocolate chips, or butterscotch chips
  • Mini versions of peanut butter cups or Rolo candies, halved or quartered as desired
  • Pretzel rods or mini pretzel twists (the mixer will break them up)
  • Potato chips for a salty-sweet treat
  • Breakfast cereal such as Special K, Corn Flakes, or Golden Grahams
  • Sprinkles such as jimmies or sprinkle sanding sugar over the tops before baking
  • Halloween – add edible sugar eyes after baking
  • Christmas monster cookies – use red and green M&M’s and/or add red and green sprinkles
  • Valentine’s monster cookies  use red, pink, and white M&M’s and/or add edible sugar hearts
  • Easter or Mother’s Day – use pastel colored M&M’s

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 

Should I Chill Monster Cookie Dough?

I almost always advocate for chilling cookie dough before baking cookies because the cookies bake up thicker and are less prone to spreading. 

When chilling dough, it is always easiest to first form the balls of cookie dough, and then chill them on a large plate in the fridge. 

If you chill the whole bowl of dough and then later try to scoop out and form cookie dough balls, it’s too much chiseling and hacking away at a big blob of rock hard dough so I don’t advocate this method.

One to two hours is all this dough will need. However,  you can chill the dough for up to 3 days in the fridge before baking the cookies off.

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 

How To Freeze Monster Cookie Dough and Monster Cookies

My monster cookie recipe makes about 4 dozen average-sized cookies with a medium cookie scoop.

You can double the amount of dough per cookie, bake a few minutes longer, and wind up with about 2 dozen very large monster cookies. An actual monster-sized cookie! Think Crumbl or your favorite big bakery cookie.

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 

If you don’t want or need to bake off 24-48 cookies at once, you can:

  1. Refrigerate unbaked cookie dough balls for up to 3 days before baking them.
  2. Freeze unbaked cookie dough balls for up to 4 months before baking them.

Tip: Option 2 is a great option if you want to bake a half-dozen cookies at a time just when your cookie cravings strike!

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 

Tips for the Best Monster Cookies 

Toffee bits and coconut aren’t super traditional in monster cookies but I love both of them and always have both on hand and include them, but you can omit and replace with 1/2 cup of something else based on my suggestions above. 

I like to use mini chocolate chips in the cookies because the smaller size allows the chocolate chips to distribute more evenly I think. However, if you have regular sized chocolate chips, they are fine.

You can use either milk or semi-sweet chocolate chips. 

If you want to halve the recipe, it’s always a bit tricky when dealing with an egg amount that’s an odd-number, such as 3 eggs in this recipe.

In this case, I would crack open one egg, lightly beat it with a fork, use half of it in dough plus one other whole egg. I would simply discard the other half of the beaten egg but you can save it for scrambled eggs I suppose.

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 

Don’t crowd your homemade monster cookies on the baking sheet. I bake 8 to 12 at a time, and never more. As they bake, they’ll spread out to about 3 to 4-inches in diameter.

For best results, bake one sheet of cookies at a time on the center oven rack.

Make sure not to overbake your cookies. This goes for all cookies! All ovens, climates, ingredients, and the exact size of the dough balls varies, but I always pull my cookies when they are just showing the first signs of browning.

They will continue to cook a bit on the hot baking sheet even after you pull it from the oven so don’t be afraid to pull them even if the centers look a bit glossy and under-baked to ensure your cookies are perfectly soft, chewy, and stay that way for days.

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 
Yield: 48

Monster Cookies

Prep Time 20 minutes
Cook Time 11 minutes
Additional Time 1 hour 30 minutes
Total Time 2 hours 1 minute

Monster Cookies - My recipe for classic monster cookies that are chock full of creamy peanut butter, oats, chocolate chips, and M&M's makes both kids and adults reach for just one more cookie! Fast, EASY, soft, perfectly chewy, and they'll become a family FAVORITE in no time! 

Ingredients

  • 1 cup granulated sugar
  • 1 cup light brown sugar, packed
  • 1 cup creamy peanut butter*
  • ½ cup unsalted butter, softened
  • 3 large eggs
  • 2 teaspoons vanilla extract
  • 2½ cups quick 1-minute oats**
  • 1 cup all-purpose flour
  • 2 teaspoons baking soda
  • ½ teaspoon salt
  • 1½ cup m&m's
  • 1 cup mini chocolate chips (regular-sized chocolate chips may be substituted; milk or dark is fine)
  • ½ cup Heath Toffee Bits***
  • ½ cup shredded coconut***

Instructions

  1. To the bowl of a stand mixer fitted with the paddle attachment, or to a large mixing bowl and handheld electric mixer, add the sugars, peanut butter, butter, vanilla, and beat on high-speed until smooth and creamy. Stop and scrape down the sides of the bowl.
  2. With the mixer running on low, add the eggs one at a time, beating for 30 seconds after each addition.
  3. Slowly add the quick cook 1-minute oats, flour, salt, and beat on medium-low speed until just combined.Stop and scrape down the sides of the bowl.
  4. Add the M&M's, chocolate chips, toffee bits, shredded coconut, and beat until just combined.
  5. Using a medium cookie scoop, form approximately 2-tablespoon sized balls, place them on a large platter, cover with plastic wrap, and refrigerate the dough for 1 to 2 hours. Tips - Dough can be refrigerated for up to 3 days or frozen for up to 4 months before baking. This is great when you just want to bake a half dozen cookies at a time. If baking directly from frozen, you don't need to thaw the dough. Simply add a couple minutes to the baking time.
  6. Preheat oven to 350F, place the cookie dough balls on a baking sheet lined with a Silpat liner or parchment paper, (don't bake more than 8 to 12 per sheet), and bake for approximately 11 to 13 minutes, or as necessary until the cookies are done in your oven. Tips - Make sure not to overbake. I pull the cookies when the edges are just set even if the centers appear a bit pale and glossy because they firm up as the cool. Cookies will keep airtight at room temp for up to 5 days or in the freezer for up to 4 months.

Notes

*When I bake, I always use a processed peanut butter like creamy Jif or Skippy. I don’t recommend using natural peanut butter or any type of peanut butter than can separate in your monster cookies recipe because sometimes it doesn’t survive the baking process well and your cookies may spread too much.

**I use Quaker Quick 1-Minute Oats. If all you have on hand are old-fashioned whole grain oats, pulse them a couple of times in your food processor to break them down into a finer, more powdery texture.

***Both the toffee bits and the coconut are optional. If you don't want to use them, simply add 1/2 cup additional of something else such as more chocolate chips or any of the substitution suggestions as outlined in the post.

Nutrition Information:

Yield:

48

Serving Size:

1

Amount Per Serving: Calories: 164Total Fat: 9gSaturated Fat: 4gTrans Fat: 0gUnsaturated Fat: 4gCholesterol: 20mgSodium: 116mgCarbohydrates: 21gFiber: 1gSugar: 16gProtein: 2g

More Easy Oatmeal Cookie Recipes:

The Best Oatmeal Chocolate Chip Cookies — Soft, chewy, loaded with chocolate, and they turn out perfectly every time! Totally irresistible!!

The Best Oatmeal Chocolate Chip Cookies - Soft, chewy, loaded with chocolate, and they turn out perfectly every time! Totally irresistible!!

Loaded Oatmeal Chocolate Chip Cookies — Soft, chewy, and loaded with chocolate! Sinking your teeth into a thick, hearty cookie is the best!

Loaded Oatmeal Chocolate Chip Cookies - Soft, chewy, and loaded with chocolate! Sinking your teeth into a thick, hearty cookie is the best!! So good!

Easy Oatmeal Cookies — An incredibly FAST and EASY recipe that produces perfectly thick cookies with chewy edges and soft centers!! One bowl to wash, no mixer to drag out, and no waiting around!!

easy oatmeal cookies on cookie sheet

Soft and Chewy Oatmeal Coconut Chocolate Chip Cookies – No butter and no mixer used in these easy cookies dripping with chocolate!

Soft and Chewy Oatmeal Coconut Chocolate Chip Cookies - No butter & no mixer used in these easy cookies dripping with chocolate. Recipe at averiecooks.com

Peanut Butter Cowboy Cookies — Chewy oats, sweet coconut, crunchy pecans, peanut butter, and plenty of chocolate!! A true ‘kitchen sink’ cookie that stays soft and chewy! Everyone (not just cowboys) loves these cookies!!

Peanut Butter Cowboy Cookies - Chewy oats, sweet coconut, crunchy pecans, peanut butter, and plenty of chocolate!! A true 'kitchen sink' cookie that stays soft and chewy! Everyone (not just cowboys) loves these cookies!!

One-Bowl, No-Mixer, No-Chill Oatmeal Cookies — An incredibly FAST and EASY recipe that produces perfectly thick cookies with chewy edges and soft centers!! One bowl to wash, no mixer to drag out, and no waiting around!!

One-Bowl, No-Mixer, No-Chill Oatmeal Cookies

Soft and Chewy Pumpkin Oatmeal Chocolate Chip Cookies — These pumpkin oatmeal cookies are bursting with chocolate chips in every bite! They’re thick, hearty, perfectly chewy, and not at all cakey.

Stacked Soft and Chewy Pumpkin Oatmeal Chocolate Chip Cookies with one cut in half

One-Bowl, No-Mixer, Extra-Large Oatmeal Chocolate Chip Cookie — A FAST and EASY recipe for ONE XL soft and chewy very THICK cookie loaded with chocolate!! No mixer needed and so DELISH!!

overhead view of single serve cookie

Cowboy Cookies — These cowboy cookies are packed with oats, chocolate chips, Cornflakes, and shredded coconut. This is a flexible recipe that you can make with different mix-ins to suit whatever is in your pantry! 

stack of Cowboy Cookies 

Chocolate Chip Banana Oatmeal Cookies — These cookies are soft, moist, and oh-so chewy. They taste like banana bread and chocolate chip cookies rolled into one dessert! 

stack of Chocolate Chip Banana Oatmeal Cookies on white plate

The Best Chocolate Chip Oatmeal M&M’s Cookies — Soft, chewy, and LOADED with M&Ms and chocolate chips in every bite!! Make them today! The cookies are SO GOOD they got me a marriage proposal!!
 
 
Triple Peanut Butter Monster Cookie Bars – Soft, gooey bars loaded with M&Ms, chocolate and made for serious peanut butter lovers! So good!
 
Triple Peanut Butter Monster Cookie Bars - Soft, gooey bars loaded with M&Ms, chocolate and made for serious peanut butter lovers! So good!

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com.