These easy, mixed berry oatmeal crumble bars have a brown butter oat crust, a triple berry filling and topped with more crumble topping that's baked until golden and bubbly for the perfect summer dessert!
Crumble, crisps, and cobblers scream summer dessert to me.
There's nothing like a homemade berry crumble warm out of the oven and topped with a scoop (or two!) of vanilla ice cream.
These berry crumble bars are my favorite way to use up those leftover summer berries laying in my fridge.
The bars make it so easy to just grab and go or heat and serve with ice cream.
Either way, they're delicious and the perfect way to top off a hot summer night orrrr start a bright summer day with ;).
Mixed berry oatmeal crumble bars use strawberries, blueberries and raspberries that get baked with a brown butter shortbread-like crust.
I mean really, what's not to love here?!
Buttery + Sweet + Tart + Crunchy + Gooey= dessert heaven!!!
What you need to make triple berry oat crumble bars:
- flour
- old-fashion oats
- granulated sugar
- light brown sugar
- ground cinnamon
- butter
- egg yolk
- 2 cups berries (blueberry, raspberry, strawberry)
- fresh lemon juice
- ground ginger
- cornstarch
You can use either fresh or frozen berries in this recipe, just make sure to read the recipe notes if using frozen berries.
Any combination of berries will work! You can even add blackberries if you have them :).
Also, be sure to use old-fashioned rolled oats not quick oats in this recipe.
How to make easy mixed berry crumble bars:
- Make the base and crumble topping: melt butter in small saucepan until foamy, keep cooking until browned. Remove from heat.
- In medium mixing bowl, whisk together flour, oats sugars, ground cinnamon & ginger, and pinch of salt.
- Stir in browned butter, and 1 egg yolk. Continuing stirring until mixture is fully combined and if you squeeze it in your hand, it holds its shape.
- Reserve 1 cup of the crumble and set aside. with the remaining mixture, press into the bottom of an 8"x 8" pan.
- Make the berry filling: combine berries, sugar, lemon juice and cornstarch in a medium bowl.
- Spoon berries over the pan on top of the base cookie layer.
- Top with the remaining 1 cup of oatmeal crumble that you previously set aside.
- Bake at 350 degrees for 45-50 minutes or until you see the berries bubbling and the top golden brown.
- Remove and let cool completely before cutting into.
Top with ice cream if desired or serve cold out of the refrigerator!
Berry oatmeal crumble bars are best serve either room temperature or you can pop them in the freezer for a frozen treat.
Leftovers can be stored in an airtight container for up to two days or refrigerated for 1 week.
These bars can also be frozen for up to 3 months.
For more delicious summer desserts try:
- Roasted Strawberry-Filled Cupcakes with Cream Cheese Frosting
- Peach-Blueberry Lavender Crostata
- Triple Berry Custard Pie with Crumble Topping
Mixed Berry Oatmeal Crumble Bars
These easy, mixed berry oatmeal crumble bars have a brown butter oat crust, a triple berry filling and topped with more crumble topping that's baked until golden and bubbly for the perfect summer dessert!
Ingredients
For the Base Layer & Crumble Topping
- ½ cup unsalted butter
- 1 cup all-purpose flour
- ¾ cup old-fashioned rolled oats, (not quick oats or instant oats)
- ½ cup granulated sugar
- ¼ cup packed brown sugar
- 1 teaspoon cinnamon
- ¼ teaspoon ground ginger
- ¼ teaspoon salt
- 1 egg yolk
For the Mixed Berry Layer
- 2 cups fresh mixed berries (blueberry, raspberry, strawberry)
- ¼ cup granulated sugar
- 2 teaspoons cornstarch
- juice of ½ lemon (about 2 tablespoons)
- ½ tsp vanilla extract
- pinch of salt
Instructions
Make the base layer and crumble topping:
- Preheat oven to 350 F. Line an 8x8" baking pan with parchment paper and spray with non-stick cooking spray.
- Melt butter in small saucepan over medium heat. Continue melting until foamy; once it starts to brown and smell nutty remove from heat and set aside.
- In medium mixing bowl, whisk together flour, oats, ½ cup granulated sugar, light brown sugar, ground cinnamon, ginger and pinch of salt.
- Stir in browned butter, and 1 egg yolk. Continuing stirring until mixture is fully combined (if you squeeze it in your hand, it should hold its shape)
- Reserve 1 cup of the crumble and set aside. With the remaining mixture, press into the bottom of the prepared pan.
Make the mixed berry layer:
- In medium mixing bowl, combine berries, granulated sugar, cornstarch, lemon juice, vanilla extract and a pinch of salt in a medium bowl.
- Spoon berries over the pressed base layer.
- Top with the remaining 1 cup of oatmeal crumble that you previously set aside.
- Bake at 350 degrees for 45-50 minutes or until you see the berries bubbling and the top golden brown.
- Remove from oven, transfer to a wire rack and let cool completely before cutting into.
Notes
Recipe adapted from JustSoTasty.com
If using frozen berries, reduce lemon juice to 1 tbsp and increase cooking time to 55-60 minutes.
Bars can be stored in an airtight container up to 2 days or refrigerated for up to 1 week.
They can also be frozen for up to 3 months.
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Nutrition Information:
Yield: 9 Serving Size: 1Amount Per Serving: Calories: 290Total Fat: 11gSaturated Fat: 7gTrans Fat: 0gUnsaturated Fat: 4gCholesterol: 48mgSodium: 95mgCarbohydrates: 45gFiber: 3gSugar: 27gProtein: 3g