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A stack of blueberry crumble bars on a plate with more in the background.
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4.54 from 41 votes

Blueberry Crumble Bars

These perfectly simple to make Blueberry Crumble Bars are filled with plump, juicy and sweet citrus hinted blueberries are layered on top of a shortbread crust and topped with a delicious buttery crumble!
Prep Time20 minutes
Cook Time38 minutes
Total Time58 minutes
Course: Dessert
Cuisine: American
Servings: 12 bars
Calories: 230kcal

Ingredients

For the Crumble and Crust:

  • 1 ½ cups all-purpose flour
  • ½ cup granulated sugar
  • ½ teaspoon baking powder
  • Pinch salt
  • 10 tablespoons unsalted butter cold and cut into cubes
  • 1 large egg yolk
  • 1 tablespoon cold water

For the Blueberry Filling:

  • 2 cups fresh blueberries
  • 2 tablespoons lime juice
  • 2 tablespoons all-purpose flour
  • ½ cup granulated sugar
  • ¼ teaspoon ground cinnamon
  • 1 teaspoon vanilla extract

Instructions

For the Crumble and Crust:

  • Preheat the oven to 375 degrees F. Prepare a 8×8-inch baking pan with the non-stick coating of your choice.
  • For the crumble and crust, whisk together flour, sugar, baking powder and salt.
  • Next, cut in the cold butter using two forks or a pastry cutter then slowly mix in the egg yolk and cold water. Don't worry if the dough seems really crumbly. It should be!
  • Next take half of the crumble mixture and press into the prepared pan. The rest should be saved for the top of the bars.

For the Blueberry Filling:

  • Stir together blueberries, lime juice, flour, sugar, cinnamon and vanilla until combined.
  • To assemble, evenly add blueberry filling to top of crust.
  • Next sprinkle the remaining crumble over the top of the blueberry filling.
  • Bake for 30-38 minutes or until golden brown and set.
  • Cool bars to room temperature then cut and serve.

Notes

Don't thaw frozen blueberries if using them.  Just roll them in a little flour so it soaks up some of the additional wetness as it bakes in the oven.
Use cold butter and cold water for the crust! This is what makes your crumble crust light, flaky, and crumbly.
Blueberry crumb bars are best served warm and even better with a scoop of ice cream!
Allow the bars to cool to room temperature before cutting them. This allows them to set so they don't fall apart when cut.

Nutrition

Calories: 230kcal | Carbohydrates: 33g | Protein: 2g | Fat: 10g | Saturated Fat: 6g | Cholesterol: 40mg | Sodium: 3mg | Potassium: 52mg | Fiber: 1g | Sugar: 19g | Vitamin A: 325IU | Vitamin C: 3.1mg | Calcium: 16mg | Iron: 0.9mg