Blueberry Lemon Pie Bars
These Blueberry Lemon Pie Bars start with a buttery shortbread crust, a bright lemon custard center, and a jammy blueberry swirl. They're simple enough to make on a Wednesday night and pretty enough to be the star of any summer potluck. Just 20 minutes of hands-on work and 40 minutes in the oven – the hardest part is waiting for them to chill before cutting.
Equipment
- 8x8 or 9x9 baking pan (metal or glass)
- Electric mixer (hand or stand)
- Medium Saucepan
- Sharp Knife
- Pastry cutter (or your fingertips)
Ingredients
For the Crust
- 1 1/2 cups all-purpose flour
- 1/2 cup powdered sugar
- 3/4 cup unsalted butter (cold, cubed)
- 1 teaspoon vanilla extract
For the Lemon Custard
- 1 can (14 oz) sweetened condensed milk
- 3 large egg yolks
- 1/2 cup fresh lemon juice
For the Blueberry Swirl
- 1 1/2 cups blueberries (fresh or frozen, do not thaw)
- 2 tablespoons granulated sugar
- 1 teaspoon lemon zest
- 1 teaspoon cornstarch
Instructions
- Preheat oven to 350°F. Line an 8x8 or 9x9 baking pan with parchment paper, leaving a 2-inch overhang on two sides.
- Make the crust: In a medium bowl, whisk together flour and powdered sugar. Cut in cold butter using a pastry cutter or your fingertips until the mixture resembles coarse sand with a few pea-sized butter pieces. Stir in vanilla. Press firmly into the prepared pan.
- Par-bake the crust for 14-16 minutes, until the edges are just barely golden. The center will still look pale. Let cool for 10 minutes.
- Make the blueberry swirl: In a small saucepan, combine blueberries, sugar, lemon zest, and cornstarch. Cook over medium heat for 5-7 minutes, mashing gently, until the mixture thickens to a jammy consistency. Set aside.
- Make the lemon custard: In a large bowl, whisk together sweetened condensed milk, egg yolks, and fresh lemon juice until smooth.
- Assemble: Pour lemon custard over the warm crust. Drop spoonfuls of blueberry jam on top and swirl gently with a knife or toothpick – just a few figure-eights to avoid muddying the colors.
- Bake for 20-22 minutes, until the edges are set and the center jiggles slightly when shaken. A toothpick inserted in the center should come out mostly clean.
- Cool at room temperature for 30 minutes, then refrigerate for at least 2 hours (overnight is best) before cutting into bars. Run a hot knife under water and dry it for clean slices.
Notes
Mistakes to avoid: Don't over-swirl the blueberry jam – two or three gentle figure-eights are plenty. Use cold butter for the crust, and always line the pan with parchment for easy removal. The overnight chill is non-negotiable for clean slices.
Make-ahead: Store in an airtight container in the fridge for up to 5 days. Freeze individual bars wrapped tightly in plastic wrap for up to 3 months; thaw in the fridge overnight.
Substitutions: For gluten-free, use a 1:1 gluten-free flour blend. Swap blueberries for raspberries or strawberries. For extra lemon, add zest to the crust and custard.