Lemon squares are the quintessential sunshine dessert—a buttery, tender shortbread crust topped with a bright, tangy, and impossibly silky lemon curd that’s both sweet and tart in perfect balance.
Dusted with a snowy blanket of powdered sugar, they’re as beautiful as they are delicious. Whether for spring gatherings, summer picnics, or just because you need a little brightness in your day, these lemon squares deliver.
This recipe achieves that perfect texture: a crust that’s sturdy but not hard, a filling that’s smooth and set but still soft and luxurious, and a flavor that makes your mouth pucker just enough before the sweetness balances it out.
Instructions
Prep and Preheat
Preheat your oven to 350°F (175°C). Line an 8×8 or 9×9-inch baking pan with parchment paper, leaving overhang on two sides for easy removal.
Make the Crust
In a medium bowl, whisk together the flour, powdered sugar, and salt. Add the cold butter cubes. Using a pastry blender or your fingertips, cut the butter into the flour mixture until it resembles coarse meal with some pea-sized butter pieces remaining. Press the mixture firmly and evenly into the bottom of the prepared pan.
Bake the Crust
Bake for 18-20 minutes, until the edges are lightly golden and the crust is set. Remove from oven and set aside while you prepare the filling. (Keep the oven on.)
Make the Lemon Filling
In a large bowl, whisk together the eggs and granulated sugar until well combined and slightly pale. Add the flour, baking powder, and salt, and whisk until smooth. Gradually whisk in the fresh lemon juice and lemon zest until fully incorporated. The mixture will be thin.
Pour over Crust
Pour the lemon filling over the warm crust. It’s okay if the crust is still hot—this helps the filling set evenly.
Bake
Bake for 20-25 minutes, until the filling is just set around the edges but still slightly jiggly in the center. It should not be completely firm—it will continue to set as it cools.
Cool Completely
Let the lemon squares cool completely in the pan on a wire rack. Then refrigerate for at least 2 hours, preferably 3-4 hours, until fully chilled and set. This makes for clean slicing.
Slice
Using the parchment overhang, lift the entire block out of the pan and place on a cutting board. Use a sharp knife to cut into squares, wiping the knife clean between cuts for neat edges.
Dust and Serve
Just before serving, generously dust the tops with powdered sugar. Serve chilled or at room temperature.
Pro-Tips for Lemon Square Perfection
- Use Fresh Lemons: Bottled lemon juice lacks the bright, complex flavor of fresh. Roll lemons on the counter before juicing to release more juice.
- Don’t Overbake the Filling: The filling should still have a slight jiggle when you remove it from the oven. Overbaking can cause cracks and a rubbery texture.
- Chill Thoroughly: Patience is key—chilling allows the filling to set completely for clean, beautiful slices.
- Wipe the Knife Clean: For picture-perfect squares, wipe the knife between each cut.
- Dust Right Before Serving: Powdered sugar will dissolve into the filling over time. Add it just before serving for that beautiful snowy appearance.
- Room Temperature Eggs: Cold eggs can cause the filling to seize. Let them warm up first.
- Add a Flavor Twist: Try adding a tablespoon of lavender, a splash of limoncello, or a layer of raspberry jam under the filling.
- Make Ahead: Lemon squares keep well in the refrigerator for up to 5 days. They’re even better the next day.
These Perfect Lemon Squares are tangy, sweet, and absolutely irresistible.
