Blueberry Crumble Bars: A Humble Summer Delight
These easy Blueberry Crumble Bars are the perfect summer dessert, using fresh berries with a buttery, crumbly crust and a hint of lemon zest. Simple, delicious, and irresistible!
Summer is the perfect time for fresh, fruit-filled desserts, and these Blueberry Crumble Bars are the ideal treat to showcase the season's best berries. This humble, easy-to-make dessert uses up fresh blueberries in the most satisfying way. With a buttery, crumbly crust and a juicy blueberry filling, it's the kind of dessert that feels comforting yet light, perfect for everything from casual weeknight dinners to a special summer gathering.
The recipe is wonderfully simple, relying on basic pantry ingredients you likely already have. The crust and topping are made from flour, sugar, and butter—simple ingredients that transform into something irresistible.
Ingredients
- 3 cups all-purpose flour (360g)
- 1/2 cup white sugar, for crust (100g)
- 1/2 cup brown sugar, packed (110g)
- 1 teaspoon baking powder
- 1/4 teaspoon salt
- 1 cup cold unsalted butter (226g)
- 1 large egg
- 4 cups fresh blueberries (560g)
- 1/2 cup white sugar, for filling (100g)
- 1 tablespoon cornstarch
- Zest of 2 lemons
- 1 teaspoon vanilla extract
- 1 tablespoon lemon juice (optional)
Instructions
- 1
Preheat the oven to 375°F (190°C). Grease a 9x13-inch (23x33 cm) baking pan.
- 2
In a medium bowl, stir together the flour, white sugar, brown sugar, and baking powder. Add the salt. Use a fork or pastry cutter to blend in the cold butter and egg until the mixture is crumbly.
- 3
Pat half of the dough mixture into the bottom of the prepared pan to form the crust.
- 4
In a separate bowl, stir together the sugar and cornstarch. Add the fresh blueberries, lemon zest, vanilla extract, and lemon juice (if using), and gently toss to coat the blueberries with the sugar mixture.
- 5
Evenly distribute the blueberry mixture over the prepared crust. Crumble the remaining dough on top of the blueberries.
- 6
Bake in the preheated oven for 42–45 minutes, or until the top is golden brown and the filling is bubbling.
- 7
Let the bars cool completely before cutting them into squares.
📝 Ellen's Notes
Metal vs. Glass Pans: If you're using a glass baking pan instead of metal, reduce the oven temperature by 25°F (about 14°C) to prevent over-browning the edges and bottom. Glass conducts heat differently than metal and can bake faster, so you may also need to check for doneness a few minutes earlier. Both work beautifully—it just comes down to adjusting the time and temperature slightly.
Freezing and Storage: These bars keep well in an airtight container at room temperature for up to 2 days, though I find they're best enjoyed fresh. You can also freeze them for up to 3 months—just layer them between parchment paper in a freezer-safe container. Thaw at room temperature before serving, or enjoy them slightly chilled straight from the freezer for a refreshing summer treat.
Crust Texture: The key to getting that perfect buttery, crumbly texture is keeping your butter cold when you work it into the dry ingredients. If your mixture seems too wet or dense, your butter may have warmed up. You can pop it in the freezer for 10 minutes before continuing. The texture should resemble coarse breadcrumbs before you add the egg—not smooth or paste-like.
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