Berry Crumble Bars

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Mixed Berry Crumble Bars — Big buttery crumbles top the soft, juicy bars packed with blueberries, raspberries and strawberries! Easy, no mixer recipe that’s irresistible!! (Frozen fruit okay!)

Berry Crumble Bars - Big buttery crumbles top the soft, juicy bars packed with blueberries, raspberries and strawberries! Easy, no mixer recipe that's irresistible!! (Frozen fruit okay!)

Easy Mixed Berry Bars

I love crumble or streusel toppings and the bigger the crumbles, the happier I am. It’s even better when the crust and crumble topping are one and the same. One less step, and one less bowl to wash, and a big timesaver and that’s the case here. 

This an easy, no-mixer mixed berry dessert recipe that takes just minutes to make.

I merged three of my favorite berry bars into one to create these bars: Blueberry Pie BarsStrawberry Lemonade Bars, and Blueberry Oatmeal Crumble Bars.

Between the buttery firm crust, juicy berries, sandy crumbles, and crunchy Fisher walnuts, there are so many wonderful textures and flavors in every bite!

Berry Crumble Bars - Big buttery crumbles top the soft, juicy bars packed with blueberries, raspberries and strawberries! Easy, no mixer recipe that's irresistible!! (Frozen fruit okay!)

Ingredients in Mixed Berry Bars

For these berry crumble bars, you’ll need: 

  • Unsalted butter
  • Granulated sugar
  • Light brown sugar
  • All-purpose flour
  • Salt
  • Fisher walnuts
  • Mixed berries
  • Lemon juice
  • Cornstarch

Berry Crumble Bars - Big buttery crumbles top the soft, juicy bars packed with blueberries, raspberries and strawberries! Easy, no mixer recipe that's irresistible!! (Frozen fruit okay!)

How to Make Mixed Berry Bars

This is such a simple but impressive dessert with mixed berries! To make the berry bars, follow these steps:

  1. Make the Crust and Crumble Topping: In a large, microwave-safe bowl melt the butter, then add the sugars and whisk to combine.
  2. And the flour, optional salt, and stir to combine. 
  3. Set a heaping 3/4 cup crumble mixture aside.
  4. Transfer remaining mixture to a foil-lined 8-inch pan. Using a spatula or your fingers, hard-pack the mixture to create an even, smooth, flat crust; set aside.
  5. Make the Berry Layer: In a separate medium bowl, add all filling ingredients and toss to combine.
  6. Evenly distribute berry mixture over the crust, smoothing it lightly with a spatula.
  7. Evenly sprinkle the reserved heaping 3/4 cup crust mixture. 
  8. Evenly sprinkle on the walnuts.
  9. Bake the Bars: Bake until the edges are bubbling quite vigorously and there’s some bubbling in the center. Crumble topping should appear set and very pale golden.
  10. Place pan on a wire rack and allow bars to cool for at least 2 hours (overnight is even better) before slicing and serving. 

Berry Crumble Bars - Big buttery crumbles top the soft, juicy bars packed with blueberries, raspberries and strawberries! Easy, no mixer recipe that's irresistible!! (Frozen fruit okay!)

Should I Use Fresh or Frozen Mixed Berries? 

I generally bake with frozen fruit because it’s cheaper and readily available year-round, but of course you can use fresh. I used a combo of strawberries, blueberries, raspberries, and blackberries.

Baking time will vary based on if your berries are fresh, frozen, and how juicy they are. Watch your bars and not the clock when evaluating doneness.

Can I Double This Recipe? 

Yes! You can double the ingredients and bake the bars in a 9×13-inch pan. 

Berry Crumble Bars - Big buttery crumbles top the soft, juicy bars packed with blueberries, raspberries and strawberries! Easy, no mixer recipe that's irresistible!! (Frozen fruit okay!)

Tips for the Best Mixed Berry Bars

I used frozen berries in this mixed berry dessert and the pan was very cold going into the oven and baked for 68 minutes. If using fresh berries, baking time will likely be reduced; start checking at 40 minutes. Watch your bars, not the clock, when evaluating doneness.

After the bars have cooled, I placed the pan in the fridge 2 hours before slicing to ensure clean, neat cuts. If you try to slice the bars before they’ve cooled completely, they’ll be extremely messy and could fall apart. 

The crumble bars will keep airtight at room temperature for up to 1 week, in the fridge for up to 10 days (they’re good slightly chilled if you like chilled pie and I store them in the fridge), or in the freezer for up to 6 months.

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4.63 from 8 votes

Berry Crumble Bars

By Averie Sunshine
Big buttery crumbles top the soft, juicy bars packed with blueberries, raspberries and strawberries! Easy, no mixer recipe that's irresistible!! (Frozen fruit okay!)
Prep Time: 15 minutes
Cook Time: 1 hour 15 minutes
Cooling Time: 2 hours
Total Time: 3 hours 30 minutes
Servings: 12
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Ingredients  

Crust and Crumble Topping

  • ½ cup unsalted butter, melted
  • ½ cup granulated sugar
  • ¼ cup light brown sugar, packed
  • 1 ½ cups all-purpose flour
  • pinch salt, optional and to taste
  • ¼ cup diced Fisher walnuts

Berry Layer

  • 2 cups mixed berries, fresh or frozen; I used frozen strawberries, blueberries, raspberries, and blackberries.
  • cup granulated sugar, or 1/2 cup if berries are sour
  • 2 tablespoons lemon juice
  • 2 teaspoons cornstarch

Instructions 

  • Preheat oven to 350F. Line an 8-inch square pan with aluminum foil and spray with cooking spray; set aside. Lining the pan will really help with cleanup and is recommended.
  • Crust and Crumble Topping – In a large, microwave-safe bowl melt the butter, about 1 minute on high power.
  • Add the sugars and whisk to combine.
  • And the flour, optional salt, and stir to combine. Mixture will be very dry and sandy with some larger, well-formed crumble pieces.
  • Set a heaping 3/4 cup crumble mixture aside.
  • Transfer remaining mixture to prepared pan, and using a spatula or your fingers, hard-pack the mixture to create an even, smooth, flat crust; set aside.
  • Berry Layer – In a separate medium bowl, add all filling ingredients and toss to combine.
  • Evenly distribute berry mixture over the crust, smoothing it lightly with a spatula.
  • Evenly sprinkle the reserved heaping 3/4 cup crust mixture. Before sprinkling, I squeeze the mixture in my palm to encourage bigger crumble pieces to form.
  • Evenly sprinkle the walnuts.
  • Bake for about 60 to 75 minutes (place pan on a cookie sheet for insurance against overflow if your pan is quite full), or until edges are bubbling quite vigorously and there’s some bubbling in the center. Crumble topping should appear set and very pale golden.
  • Place pan on a wire rack and allow bars to cool for at least 2 hours (overnight is even better) before slicing and serving. After cooling overnight, I placed pan in the fridge 2 hours before slicing to ensure clean, neat cuts. If you try to slice bars before they’ve cooled completely, they’ll be extremely messy and could fall apart. 

Notes

I used frozen berries and the pan was very cold going into the oven and baked for 68 minutes. If using fresh berries, baking time will likely be reduced; start checking at 40 minutes. Watch your bars, not the clock, when evaluating doneness.
Adapted from Blueberry Pie Bars, Strawberry Lemonade Bars, and Blueberry Oatmeal Crumble Bars
Storage: Bars will keep airtight at room temperature for up to 1 week, in the fridge for up to 10 days (they’re good slightly chilled if you like chilled pie and I store them in the fridge), or in the freezer for up to 6 months.

Nutrition

Serving: 1, Calories: 206kcal, Carbohydrates: 33g, Protein: 2g, Fat: 8g, Saturated Fat: 5g, Polyunsaturated Fat: 3g, Cholesterol: 20mg, Sodium: 14mg, Fiber: 1g, Sugar: 19g

Nutrition information is automatically calculated, so should only be used as an approximation.

More Berry Desserts: 

Strawberry Lemonade Bars — Imagine crossing lemon bars with a strawberry pie. These easy bars taste like strawberry lemonade! Sooo good!

Strawberry Lemonade Bars - Imagine crossing lemon bars with a strawberry pie. These easy bars taste like strawberry lemonade! Sooo good!

Blueberry Pie Bars – Super soft, easy bars with a creamy filling, streusel topping and abundance of juicy blueberries!

Blueberry Pie Bars - Super soft, easy bars with a creamy filling, streusel topping and abundance of juicy blueberries! Sooo darn good!

Tropical Escape Soft Pineapple Crumble Bars — Sweet, soft bars with big pineapple chunks that taste like a tropical vacation!

Tropical Escape Soft Pineapple Crumble Bars - Sweet, soft bars with big pineapple chunks that taste like a tropical vacation!

Oatmeal Mango Bars – These buttery bars are loaded with sweet fresh mango!! Just 10 minutes of prep, so EASY because the crust and crumble are one and the same, and a guaranteed family FAVORITE!!

Mango Oatmeal Crumble Bars – These buttery bars are loaded with sweet fresh mango!! Just 10 minutes of prep, so EASY because the crust and crumble are one and the same, and a guaranteed family FAVORITE!!

Strawberry Oatmeal Bars with Crumble Topping — These buttery bars are bursting with fresh strawberries!! Just 10 minutes of prep, so EASY because the crust and crumble are one and the same, and a crowd FAVORITE every time!!

Strawberry Bars — Easy, no mixer bars with a shortbread crust, one pound of fresh berries, a layer of sweet custard, and creamy whipped topping!! A perfect warm weather dessert that everyone LOVES!!

Post is brought to you by Fisher. The recipes, images, text, and opinions expressed are my own. #ThinkFisher

About the Author

Welcome to AverieCooks! Here you’ll find fast and easy recipes that taste amazing and are geared for real life. Nothing fussy or complicated, just awesome tasting dishes everyone loves!

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Please note: I have only made the recipe as written, and cannot give advice or predict what will happen if you change something. If you have a question regarding changing, altering, or making substitutions to the recipe, please check out the FAQ page for more info.

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Comments

  1. 5 stars
    So, I tried the recipe exactly as written today and the bars came out absolutely exquisite! The crust is perfection and the frozen fruit worked out great. Now, here’s the thing. I tried making it a week ago and thought there must have been something wrong with the amount of “glaze” for the fruit so I doubled it (don’t you hate when people mess with your recipe?) The upshot was, it turned into a juicy, gooey berry cobbler. So, the bottom line is, even if you mess with it, it still turns out great. I’m serving these to some folks who are often without food, so homemade with berries and freshly churned ice cream is a real treat! Thank you for your wonderful recipe! I will be sharing it on my FB page!

    1. Thanks for the 5 star review and glad it came out great, both ways! Experimentation is part of cooking and I love when people try things – but if they don’t work out and they blame me when they didn’t follow the recipe, that’s the only thing that can get a little tricky.

      Thanks for sharing on your page, too!

  2. 5 stars
    So, I tried the recipe exactly as written today and the bars came out absolutely exquisite! The crust is perfection and the frozen fruit worked out great. Now, here’s the thing. I tried making it a week ago and thought there must have been something wrong with the amount of “glaze” for the fruit so I doubled it (don’t you hate when people mess with your recipe?) The upshot was, it turned into a juicy, gooey berry cobbler. So, the bottom line is, even if you mess with it, it still turns out great. I’m serving these to some folks who are often without food, so homemade with berries and freshly churned ice cream is a real treat! Thank you for your wonderful recipe! I will be sharing it on my FB page!

  3. I made these today with freshly picked berries- red raspberries, golden raspberries, and blueberries. They were delicious and the perfect balance of flavors and ratios of fruit to crumb/crust. I loved the lemon flavor in the berries! Perfect recipe!

    1. Thanks for trying the recipe and I’m glad it came out great for you! Your choice of berries sounds delicious!

  4. I doubled this recipe to have a 9×13 pan full. It was delish! My only concern was that the crust seemed too soft. In your picture yours looks crispier than mine did. I used frozen and partially frozen triple berries. I had intended to use all frozen but I live in Kansas and it is very hot here and the fruit I had measured out prior had partially thawed. By that time the fruit measured out to be only 2 c. so I measured out another 2 c. frozen so I would have enough so I ended up with a half frozen and a half thawed and drained bunch of fruit. Do you think that could have been it?

    1. I think the half thawed fruit being as watery as it sounds like with your description, probably softened the crust a bit. You could always bake longer next time or use all fresh fruit, or use frozen straight from the freezer. Glad they tasted great!

  5. Wanted to mention that I added a bit of cinnamon and nutmeg to the crumble to subtly enhance the flavor.   Everything else I followed exactly ?

  6. Just made your berry crumble bars.  My family is happily munching as I write this.   Another hit, Averie!   Thanks 

  7. How did you get your bars to look so neat and clean? Whenever I make recipes like this it always turns out really messy and more like a crisp. Still yummy, but don’t resemble bars. Did you wait a long time before slicing?

  8. Those look great. I will definitely make them this weekend!
    Thanks a lot for sharing the recipe = )

  9. These look awesome Averie! Crumble bars are one of my favorite dessert :) Pinned!

  10. I love anything with crumble topping and I am beginning a love affair with berries. So perfect! Pinned!

  11. Hi Averie.  These look amazing – I’m so happy I found your blug, it has saved me so many times :)  Silly question for you…do I have to thaw out the frozen fruit before hand??

    1. No, you can use it directly frozen. If you do thaw it, it will start releasing juice as it warms up so just better to use frozen/very cold if you’re using frozen fruit rather than fresh.

  12. These look amazing Averie!  And I love that they’re so easy!   Just pinned! 

  13. I LOVE this recipe. I am ready to take a bite out of my screen. And you probably think I am kidding—-NOT.

  14. Berry crumble bars are my favorite! Like you said, the bigger the crumbles the better! They look delicious!

  15. Sign me up for an entire pan of these beauties – I could polish them off in seconds flat. I love berries and crumbles are one of my favorite things. So comforting!

  16. Nothing says summer like a berry crumble!  Bring on the sunshine and an extra big square, please!

  17. These look so juicy and perfect for summer! I love baking with frozen fruit — it’s so handy to have around!

  18. This is a recipe for happiness. I am a sucker for all desserts containing crumbles, crunches, and crisps.

  19. I like the convenience of frozen fruit but rarely bake with it – I may need to change that soon. And yes, the bigger the crumbles the better for me too!

    1. In most recipes, I use it because it’s easy, cheap, and I always have it around. Sometimes you can’t get away with it but usually I try :)

  20. I made one of your fruit crumble bar recipes (I don’t remember which one) last summer and I used black berries that grew in our back yard that my dad picked and froze. But as they were cooking, all these little black bugs floated to the top. I was like DAD!! You can’t freeze the berries with a bunch of bugs on them! It was so gross! So I think I need to try these again with berries from the store. No bugs :)

  21. Anything with a killer crumble topping and a ginormous amount of berries has my name written all over it! I don’t think I’d be able to stop eating these bars until the pan was empty. ;) Crushing here!! Pinned. :)

  22. I totally agree, the more crumbles the better! Load up the bars! These look so delicious and super easy too, love it!

  23. I am a HYOOGE sucker for ANYTHING with a crumble topping, and all that berrylicious-ness does not hurt either! I could devour the whole pan of these. No shame. Pinned!

  24. These look delicious–a good spring/summer dessert and nice for Mothers Day too. I love walnuts with berries so this crust and crumble looks especially good!

    1. I was trying to find a unique way to use the walnuts and they turned out to be great in the crumble!

  25. One bowl to create crumb heaven is perfect! Have never met a crumb bar I didn’t devour on sight. They’re truly the best!

  26. You had me at crumble topping….these look like a perfect dessert for Mother’s day.