Description
These Blackberry Pistachio Crumble Bars combine a buttery, nutty oat base with a vibrant blackberry filling, topped with a crunchy pistachio crumble. Perfect for a summery dessert or a delightful snack, these bars are gluten-free and bursting with fresh flavors.
Ingredients
Scale
Base and Crumble
- 1 1/2 cups Bob’s Red Mill Gluten Free Organic Old Fashioned Rolled Oats
- 1 1/4 cups + 1 tablespoon all-purpose flour
- 1/2 teaspoon cinnamon
- 1/2 teaspoon baking soda
- 3/4 teaspoon salt
- 1 cup unsalted butter, melted and cooled
- 1 cup light brown sugar, loosely packed
- 1 teaspoon vanilla extract
- 1/2 cup roasted, salted pistachios, coarsely chopped
- Flaky sea salt, optional
Filling
- 12 ounces blackberries
- 1 tablespoon cornstarch
- 1 tablespoon sugar
- 1 tablespoon lemon juice
- Pinch of salt
Instructions
- Prepare the Pan: Preheat your oven to 350℉ (177℃). Spray an 8×8 inch square metal or glass baking dish with nonstick spray, line it with parchment paper, then spray again. Set aside to ensure easy bar removal after baking.
- Make the Crumble Base: In a medium mixing bowl, whisk together the oats, all-purpose flour, cinnamon, baking soda, and salt. Separately, in a large bowl, whisk the melted butter, light brown sugar, and vanilla extract until smooth. Add the dry ingredients to the wet mixture, stirring with a rubber spatula until combined. Fold in the chopped pistachios. Let the dough rest for 5 minutes to allow the flour to absorb moisture. If the dough is too loose, gradually add more flour, one tablespoon at a time, until it has a wet sand consistency.
- Prepare the Blackberry Filling: In a medium bowl, gently mix the blackberries with cornstarch, sugar, lemon juice, and a pinch of salt. For consistency, cut or mash larger blackberries with a spoon to create a uniform filling.
- Assemble the Bars: Press just over half of the crumble mixture evenly into the prepared baking dish to form a smooth crust. Spread the blackberry filling evenly over the crust. Crumble the remaining crumble mixture evenly over the filling as a topping.
- Bake: Bake in the preheated oven for 35 minutes, or until the crumble topping is golden brown and the blackberry filling is set. Once baked, sprinkle with flaky sea salt if desired.
- Cool and Serve: Allow the bars to cool completely in the pan to firm up before cutting into squares and serving.
Notes
- If the crumble dough is too wet, add extra flour one tablespoon at a time until the texture resembles wet sand.
- Using a parchment-lined pan ensures the bars come out cleanly and easily.
- Flaky sea salt on top adds a nice contrast to the sweetness but is optional.
- For best results, let bars cool fully to set the filling before slicing.
- These bars can be stored in an airtight container at room temperature for up to 3 days or refrigerated for up to a week.
- Prep Time: 15 minutes
- Cook Time: 35 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
Keywords: blackberry crumble bars, gluten free dessert, pistachio bars, oat crumble bars, berry dessert bars
