How to Make Easy Lemon Bars

Step 1 - Prepare the pan: Preheat the oven to 350 degrees F (175 degrees C) and line an 8x8 inch baking pan with parchment paper, leaving enough overhang on two sides to lift the bars out later. This step may seem small, but it makes a big difference because lemon bars are delicate once cooled and parchment gives you clean slices without breaking the crust.

Step 2 - Make the crust: In a bowl, combine the flour, softened butter, powdered sugar, and salt until the mixture looks crumbly and evenly moistened. Press it firmly into the bottom of the prepared pan, making sure the layer is even from corner to corner, because an uneven crust will bake at different speeds and can create a dry edge with a soft center.

Step 3 - Bake the crust: Bake the crust for 18 to 20 minutes, or until it looks lightly golden around the edges and just set in the middle. The goal is not deep browning here, because the crust should finish baking gently without becoming hard, which allows it to stay tender under the filling.

Step 4 - Whisk the filling: While the crust bakes, whisk the granulated sugar, eggs, lemon juice, lemon zest, flour, and baking powder in a medium bowl until the mixture is smooth and fully combined. Whisking well matters because it dissolves the sugar more evenly and helps the filling bake into a uniform layer instead of separating or looking patchy.

Step 5 - Pour over the hot crust: Once the crust comes out of the oven, pour the lemon filling directly over the warm base. Doing this while the crust is still hot helps the two layers bond together, which reduces the chance of the filling sliding away from the base after baking and cooling.

Step 6 - Bake until set: Return the pan to the oven and bake for 20 to 25 minutes, or until the center is just set and no longer jiggles when the pan is nudged gently. The bars should look slightly glossy on top and feel firm around the edges, but avoid overbaking because too much time in the oven can make the filling rubbery instead of soft and creamy.

Step 7 - Cool completely: Place the pan on a wire rack and let the bars cool to room temperature before chilling them in the refrigerator for at least 1 hour. Cooling is not optional here, because the filling continues to set as it rests and cutting too early can cause the bars to collapse or smear instead of slicing cleanly.

Step 8 - Dust and slice: Lift the bars out using the parchment overhang, place them on a cutting board, and dust the top generously with powdered sugar just before serving. Use a sharp knife and wipe it clean between cuts for the neatest squares, then serve chilled or at cool room temperature for the best texture and flavor.