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Easy Blueberry Lemon Crumble Bars with Oat Topping

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These Easy Blueberry Lemon Crumble Bars balance bright lemon zing with the natural sweetness of blueberries, all under a satisfyingly crumbly oat topping. Perfect for a quick, crowd-pleasing dessert with a rustic texture.

Ingredients

Scale
  • 2 ½ cups all-purpose flour (310g)
  • 1 ½ cups old-fashioned rolled oats (135g)
  • ¾ cup brown sugar (150g)
  • ¼ cup granulated sugar (50g)
  • 1 cup unsalted butter, cold and cubed (225g)
  • ½ teaspoon salt
  • 1 teaspoon baking powder
  • 3 cups fresh or frozen blueberries (450g)
  • 3 tablespoons lemon juice (from about 1 large lemon)
  • 1 teaspoon lemon zest
  • ⅓ cup granulated sugar (65g)
  • 2 tablespoons cornstarch

Instructions

  1. Preheat your oven to 350°F (175°C). Butter or line a 9×13 inch baking pan with parchment paper, leaving some overhang to lift bars easily after baking.
  2. In a large bowl, combine 2 cups (250g) of the flour, oats, brown sugar, granulated sugar, salt, and baking powder. Add the cold, cubed butter.
  3. Using a pastry cutter or two forks, cut the butter into the dry ingredients until the mixture looks like coarse crumbs with some pea-sized butter pieces.
  4. Press half of the crumble mixture evenly into the bottom of your prepared pan. Use the back of a spoon or your hands but don’t compact it too firmly. Bake this base for 10-12 minutes until it’s just starting to turn golden.
  5. While the crust bakes, toss the blueberries with lemon juice, lemon zest, sugar, and cornstarch in a medium bowl until evenly coated.
  6. Remove the crust from the oven and carefully spread the blueberry mixture over the warm crust.
  7. Sprinkle the rest of the oat crumble evenly on top.
  8. Bake again for 30-35 minutes until the topping is golden brown and the filling bubbles around the edges.
  9. Let the bars cool in the pan on a wire rack for at least 2 hours to set properly.
  10. Use the parchment overhang to lift bars out, then cut into squares or rectangles. Serve slightly chilled or at room temperature.

Notes

Keep butter cold to ensure a crumbly texture. Don’t overmix the filling to avoid bursting berries. Use old-fashioned oats for best texture. If topping browns too fast, tent with foil halfway through baking. Let bars cool completely before slicing for clean cuts.

Nutrition

Keywords: blueberry bars, lemon crumble bars, oat topping dessert, easy blueberry dessert, summer dessert, crumble bars, blueberry lemon bars

Find it online: https://twirltaste.com/easy-blueberry-lemon-crumble-bars-recipe-with-oat-topping-guide/