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.

Berry Crumble Bars
Yield: 12

Berry Crumble Bars

Prep Time 15 minutes
Cook Time 1 hour 15 minutes
Cooling Time 2 hours
Total Time 3 hours 30 minutes

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

Crust and Crumble Topping

  • 1/2 cup unsalted butter, melted
  • 1/2 cup granulated sugar
  • 1/4 cup light brown sugar, packed
  • 1 1/2 cups all-purpose flour
  • pinch salt, optional and to taste
  • 1/4 cup diced Fisher walnuts

Berry Layer

  • 2 cups mixed berries (fresh or frozen; I used frozen strawberries, blueberries, raspberries, and blackberries.)
  • 1/3 cup granulated sugar (or 1/2 cup if berries are sour)
  • 2 tablespoons lemon juice
  • 2 teaspoons cornstarch

Instructions

  1. 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.
  2. Crust and Crumble Topping – In a large, microwave-safe bowl melt the butter, about 1 minute on high power.
  3. Add the sugars and whisk to combine.
  4. And the flour, optional salt, and stir to combine. Mixture will be very dry and sandy with some larger, well-formed crumble pieces.
  5. Set a heaping 3/4 cup crumble mixture aside.
  6. 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.
  7. Berry Layer – In a separate medium bowl, add all filling ingredients and toss to combine.
  8. Evenly distribute berry mixture over the crust, smoothing it lightly with a spatula.
  9. 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.
  10. Evenly sprinkle the walnuts.
  11. 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.
  12. 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 Information:

Yield:

12

Serving Size:

1

Amount Per Serving: Calories: 206Total Fat: 8gSaturated Fat: 5gTrans Fat: 0gUnsaturated Fat: 3gCholesterol: 20mgSodium: 14mgCarbohydrates: 33gFiber: 1gSugar: 19gProtein: 2g

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!!

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