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Ultimate Blackberry Crumb Bars

These Ultimate Blackberry Crumb Bars feature a buttery gluten-free oat crust, a luscious, jammy blackberry filling, and a crunchy crumble topping. An easy, foolproof, and crowd-pleasing dessert perfect for any occasion.
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Prep Time 15 minutes
Cook Time 45 minutes
Cooling Time 2 hours
Total Time 3 hours
Servings: 12 bars
Course: Dessert, Snack
Cuisine: American
Calories: 310
Ingredients Method Notes

Ingredients
  

  • For the Crumb Mixture & Crust: For the Crumb Mixture & Crust:
  • 2 cups gluten free oats 2 cups gluten free oats
  • 2 cups gluten free flour 2 cups gluten free flour
  • 2 cups brown sugar 2 cups brown sugar
  • 1 cup butter, melted 1 cup butter, melted
  • 1 tsp baking powder 1 tsp baking powder
  • 1 tsp salt 1 tsp salt
  • For the Blackberry Filling: For the Blackberry Filling:
  • 4 cups blackberries, rinsed and drained 4 cups blackberries, rinsed and drained
  • 1 lemon, juiced 1 lemon, juiced
  • 1/4 cup white sugar 1/4 cup white sugar
  • 2 tbsp corn starch 2 tbsp corn starch

Method
 

  1. 1. Preheat your oven to 350°F (175°C). In a large mixing bowl, combine all ingredients for the crumb layers (oats, flour, brown sugar, melted butter, baking powder, salt).
  2. 2. Press half of the mixture firmly into a greased and parchment-lined 9×11 baking dish to form the crust.
  3. 3. In a medium saucepan, combine all ingredients for the berry layer. Mix well and simmer on low for 10 minutes until a thick, smooth syrup forms.
  4. 4. Pour the berry mixture over the oat crust and top with the remaining oat mixture.
  5. 5. Bake for 45 minutes until golden brown and bubbly.
  6. 6. Allow the bars to cool completely in the pan before cutting into 12 bars to ensure they set properly. Serving with vanilla ice cream is optional but highly encouraged!

Notes

Let Bars Cool Completely: This is the most important tip! For clean slices, the bars must be at room temperature or even slightly chilled before cutting.
Parchment Paper Sling: Use parchment paper with overhang on the sides of the pan. This makes it easy to lift the entire block of bars out for easy cutting.
Fruit Variations: This recipe works wonderfully with other fruits like blueberries, raspberries, or chopped peaches. Adjust sugar as needed based on the sweetness of your fruit.