Blueberry Pie Bars

Blueberry Pie Bars bring all the charm of homemade blueberry pie into an easier, sliceable dessert. A buttery vanilla shortbread crust supports a bright, jammy blueberry filling, while golden crumbs add a delicate finish on top. Fresh lemon keeps the berries lively without turning the bars into a lemon dessert.

The filling is briefly cooked before baking, which gives it a reliable set and helps every square hold together beautifully. Meanwhile, a cup of whole berries is folded in at the end for juicy bursts throughout. The crust and topping also come from one simple mixture, so preparation stays practical and cleanup remains light.

These bars are lovely at room temperature, slightly chilled, or gently warmed with vanilla ice cream. They are also easy to prepare ahead, making them a dependable dessert for gatherings, coffee breaks, and whenever a full pie feels like one project too many.

Recipe Yield: 16 bars

INGREDIENTS

For the crust and crumble:
2 3/4 cups all-purpose flour, spooned and leveled
3/4 cup granulated sugar
1/2 tsp baking powder
3/4 tsp kosher salt
1 cup unsalted butter, cold and cut into 1/2-inch cubes
1 large egg
2 tsp pure vanilla extract

For the blueberry filling:
5 cups fresh blueberries, divided
1/2 cup granulated sugar
3 tbsp cornstarch
2 tbsp fresh lemon juice
1/4 tsp kosher salt
2 tsp finely grated lemon zest
1 tsp pure vanilla extract

INSTRUCTIONS

1. Prepare the pan:
Preheat the oven to 350°F. Lightly grease a 9×13-inch metal baking pan and line it with parchment paper, leaving overhang on two sides.

2. Make the crumble mixture:
Whisk the flour, sugar, baking powder, and salt together. Cut in the cold butter until coarse crumbs with small pea-sized pieces form.

3. Finish the dough:
Whisk the egg and vanilla together. Drizzle over the flour mixture, then toss gently until moist clumps form and no powdery flour remains.

4. Form the crust:
Reserve 2 loosely packed cups of the mixture for the topping. Firmly press the remaining mixture evenly into the prepared pan.

5. Prebake the crust:
Bake for 15–17 minutes, until the surface looks set and the edges are lightly golden. Keep the oven heated.

6. Begin the filling:
Whisk the sugar and cornstarch together in a medium saucepan. Add 4 cups blueberries, lemon juice, and salt, then stir gently to coat.

7. Thicken the filling:
Cook over medium heat for 7–10 minutes, stirring often, until the berries release their juices and the mixture bubbles and visibly thickens.

8. Finish the filling:
Remove from the heat. Stir in the lemon zest, vanilla, and remaining 1 cup blueberries, then let the filling rest for 5 minutes.

9. Assemble the bars:
Spread the warm blueberry filling evenly over the crust. Crumble the reserved dough over the top, leaving a few small spaces for the filling to show.

10. Bake until golden:
Bake for 38–45 minutes, until the topping is golden and the filling bubbles around the edges and in several spots near the center.

11. Cool and slice:
Cool completely in the pan for at least 3 hours. Lift out using the parchment, then slice into 16 bars with a clean, sharp knife.

Helpful Tips to Perfect This Recipe

• Keep the butter genuinely cold: Cold butter creates tender, distinct crumbs. Refrigerate the crumble mixture briefly if the butter begins to soften while preparing the crust.
• Watch the filling rather than only the clock: It should look glossy, thick, and actively bubbling before leaving the stove. This prevents loose or watery blueberry pie bars.
• Frozen blueberries can be used: Add them directly from the freezer without thawing. Allow an additional 2–4 minutes on the stove and bake until the filling visibly bubbles near the center.
• Let the topping stay craggy: Press the bottom crust firmly, but scatter the topping loosely in differently sized pieces for a more delicate, homemade crumble.
• Cool before cutting: The blueberry filling continues to set as it cools. For especially clean squares, refrigerate the cooled slab for 30 minutes before slicing.