Gluten-Free Mixed Berry Crumble Bars
These easy berry crumble bars transform a simple vanilla cake mix into a delightful dessert with layers of buttery oat crumble, tangy raspberry jam, and fresh mixed berries. The combination creates a perfect balance of sweet and tart flavors with a satisfying crumbly texture. Ideal for potlucks, family gatherings, or when you need a quick dessert that looks homemade but requires minimal effort. The cake mix base saves time while still delivering homemade taste.
Ingredients
- 1 box vanilla cake mixyellow cake mix1:1baking
works equally well
- 2 ½ cup quick cook oatsold fashioned oats1:1texture
slightly chewier texture
- ¾ cup butter, melted
- 2 cup mixed berries, fresh or frozensingle berry type1:1flavor
use blueberries, raspberries, or strawberries
- ¼ cup raspberry jam
Instructions
- 1
Preheat oven to 375 degrees
- 2
Line a 9x9 pan with parchment and set aside
- 3
In mixer bowl combine cake mix, oats and melted butter and stir on low until fully combined and crumbly
- 4
Press 3/4 of the mix into your prepared dish making a nice even bottom layer
- 5
Top with raspberry jam and spread into even layer
- 6
Top with berries
- 7
Sprinkle remaining mix over the top and press in slightly
- 8
Bake 19-25 minutes or until golden brown
- 9
Cool completely before cutting
- 10
Dust with confectioners sugar if desired before serving
Tips
Press the bottom layer firmly to prevent crumbly bars that fall apart when cut.
Use parchment paper overhang to easily lift bars from pan for clean cutting.
Let bars cool completely before cutting to ensure clean slices and proper setting.
Good to Know
Store covered at room temperature for up to 3 days or refrigerate for up to 1 week
Can be made up to 2 days ahead and stored covered at room temperature
Serve at room temperature, optionally dusted with confectioners sugar
Common Mistakes
Press bottom layer firmly to avoid crumbly bars that fall apart
Cool completely before cutting to prevent messy, uneven pieces
Substitutions
Dairy-Free Swaps
General Alternatives
works equally well
use blueberries, raspberries, or strawberries
slightly chewier texture
FAQ
Can I use frozen berries without thawing?
Yes, you can use frozen berries straight from the freezer. They may release slightly more juice during baking, but this adds to the flavor.
What if I don't have raspberry jam?
Any berry jam or preserves work well. Strawberry, blueberry, or mixed berry jam are excellent substitutes that complement the fresh berries.
How long do these bars keep?
Store covered at room temperature for up to 3 days or refrigerate for up to 1 week. They maintain best texture at room temperature.