Step 1: Preheat your oven to 375°F (190°C). Grease and flour an 8x8 inch baking pan, or line with parchment paper, leaving an overhang on the sides for easy removal. This preparation is key for many blueberry dessert recipes.
Step 2: In a large bowl, whisk together the flour, sugar, baking powder, and salt for the crust and crumb topping. Cut in the cold, cubed butter using a pastry blender, your fingertips, or a food processor until the mixture resembles coarse crumbs. This technique is fundamental for creating excellent blueberry dessert recipes.
Step 3: In a small bowl, whisk together the egg and vanilla extract. Add this to the flour mixture and mix until just combined, forming a soft dough. Be careful not to overmix.
Step 4: Press about two-thirds of the dough evenly into the prepared baking pan to form the crust. Reserve the remaining one-third of the dough for the crumb topping. This base is essential for these blueberry dessert recipes.
Step 5: In another medium bowl, gently combine the fresh blueberries, sugar, flour, lemon juice, and lemon zest for the filling. Toss until the blueberries are evenly coated. This bright filling is what makes these blueberry dessert recipes sing.
Step 6: Spread the blueberry mixture evenly over the pressed crust in the pan. Crumble the reserved one-third of the dough over the blueberry filling to create the streusel topping. Ensure even distribution for the best results from these blueberry dessert recipes.
Step 7: Bake for 45-50 minutes, or until the crumb topping is golden brown and the blueberry filling is bubbly. A good indication that these blueberry dessert recipes are ready is the fragrant aroma filling your kitchen.
Step 8: Remove the pan from the oven and let it cool completely on a wire rack before cutting into squares. Cooling completely is crucial for clean cuts, a trick for perfect blueberry dessert recipes. Store leftover bars in an airtight container at room temperature for up to 3 days or in the refrigerator for up to 5 days.