Blackberry Pistachio Crumble Bars
Blackberry Pistachio Crumble Bars are a sweet, tart treat with juicy berries and crunchy pistachios. This simple recipe delivers a wholesome snack bar perfect for any gathering or cozy moment.
Ingredients
For the Base and Crumble Topping:
- 1 ½ cups gluten-free rolled oats
- 1 ¼ cups all-purpose flour plus 1 tbsp if needed
- ½ tsp ground cinnamon
- ½ tsp baking soda
- ¾ tsp salt
- 1 cup unsalted butter melted and cooled
- 1 cup light brown sugar loosely packed
- 1 tsp vanilla extract
- ½ cup roasted salted pistachios, coarsely chopped
- Flaky sea salt optional, for garnish
For the Blackberry Filling:
- 12 oz fresh blackberries
- 1 tbsp cornstarch
- 1 tbsp sugar
- 1 tbsp lemon juice
- Pinch of salt
Instructions
Prep Pan and Oven
- I preheat the oven to 350°F (175°C), spray an 8x8-inch pan with nonstick spray, and line with parchment, leaving overhang, for this simple recipe.
Mix Crumble Base
- I whisk 1 ½ cups oats, 1 ¼ cups flour, ½ tsp cinnamon, ½ tsp baking soda, and ¾ tsp salt in a bowl. In another, I mix 1 cup melted butter, 1 cup brown sugar, and 1 tsp vanilla, then combine with dry ingredients and ½ cup pistachios, adding 1 tbsp flour if too wet, resting 5 minutes for this fruity crumble dessert.
Prepare Blackberry Filling
- I mix 12 oz blackberries with 1 tbsp cornstarch, 1 tbsp sugar, 1 tbsp lemon juice, and a pinch of salt, mashing large berries lightly for these berry crumble bars.
Assemble Layers
- I press just over half the crumble mixture into the pan for a firm base, spread the blackberry filling evenly, and sprinkle the remaining crumble loosely on top for this Blackberry Pistachio Crumble Bars.
Bake Bars
- I bake 35 minutes until golden and bubbly, ensuring a set crust for this simple recipe.
Cool and Slice
- I cool the bars completely in the pan on a rack, lift out using parchment, slice into squares, and sprinkle with flaky sea salt for this fruity crumble dessert.
Notes
- To use frozen blackberries, thaw and drain well before use.
- Bars can be stored at room temperature for 2 days or refrigerated for 5 days.
- Freeze individually wrapped bars for up to 2 months.
- Don’t press the crumble topping—keeping it loose ensures perfect texture.
- Optional add-ins: coconut, chopped white chocolate, orange zest, or other berries.
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