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Blueberry Crumble Bars Recipe

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4.3 from 5 reviews

Delight in these delicious Blueberry Crumble Bars featuring a buttery oat crust and topping with a sweet, tangy blueberry filling. Perfect for a snack or dessert, these bars combine a crisp crumble texture with juicy blueberries and a hint of lemon zest.

  • Total Time: 55 minutes
  • Yield: 16 bars

Ingredients

Crust & Topping

  • 1 1/2 cups all-purpose flour
  • 1 1/2 cups old fashioned rolled oats
  • 3/4 cups light brown sugar
  • 1/2 teaspoon cinnamon
  • 1/2 teaspoon kosher salt
  • 1 cup cold butter, cubed (2 sticks)

Filling

  • 1/2 cup granulated sugar
  • 3 tablespoons cornstarch
  • 2 1/2 cups blueberries
  • 1 tablespoon lemon juice
  • 1 teaspoon lemon zest

Instructions

  1. Prepare Pan: Line a 9×9-inch pan with parchment paper and coat with nonstick spray to prevent sticking. Set aside.
  2. Make Crust & Topping Mixture: In a large bowl, whisk together flour, oats, brown sugar, cinnamon, and salt. Add cold, cubed butter and use a pastry blender to cut the butter into the dry ingredients until the mixture resembles very coarse sand.
  3. Form Crust: Divide the mixture in half. Press half firmly into the bottom of the prepared pan to create an even crust layer. Reserve the remaining half for the crumble topping.
  4. Prepare Filling: In another large bowl, whisk together granulated sugar and cornstarch. Gently fold in the blueberries, coating them evenly. Add lemon juice and zest, stirring delicately to combine without crushing the berries.
  5. Assemble Bars: Spread the blueberry mixture evenly over the crust in the pan. Sprinkle the reserved crumble mixture evenly over the blueberry layer and lightly press it down.
  6. Chill: Refrigerate the assembled bars for 30 minutes to help them set before baking.
  7. Bake: Preheat the oven to 350°F (175°C). Bake the bars for 35 to 40 minutes until the fruit begins to bubble and the crumble topping is golden brown.
  8. Cool and Serve: Remove from the oven and allow bars to cool completely before cutting into 16 squares for serving.

Notes

  • Ensure butter is cold when cutting into the flour mixture for the best crumbly texture.
  • Use fresh or frozen blueberries; if using frozen, do not thaw before mixing.
  • Line the pan with parchment paper to make removal easier and simplify cleanup.
  • Bars can be stored in an airtight container at room temperature for up to 3 days or refrigerated for up to a week.
  • Optional: sprinkle a little coarse sugar over the topping before baking for extra crunch.
  • Author: Chef
  • Prep Time: 15 minutes
  • Cook Time: 40 minutes
  • Category: Dessert
  • Method: Baking
  • Cuisine: American