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Lemon Bars

A crisp shortbread base and a tart lemon filling make classic bars that hold their shape after a full cool and brief chill.
Lemon bars with bright yellow filling and a thin shortbread crust are lightly dusted with confectioners' sugar.

Lemon bars rely on contrast: a tender, buttery base anchors a filling that is bright with fresh juice and zest. Baking the two layers in sequence helps the crust stay distinct beneath the soft lemon set.

The recipe is straightforward, but the pauses matter. Letting the slab cool fully before slicing keeps the filling smooth and the edges clean.

Press an even shortbread base

The crust mixture should resemble soft crumbs before it goes into the pan. Press it firmly into the corners and level the surface so the thin edges do not bake faster than the center.

Par-baking dries the surface and gives the filling a stable base. Pull it when it looks matte and only lightly colored at the edges; a deeply browned crust can taste too dark beside the tart lemon layer.

Keep the lemon filling smooth

Zest the lemons before juicing so the aromatic outer peel is easy to collect. Whisk the eggs and sugar until blended, then incorporate the flour, zest, and juice without beating the mixture into foam.

Pour the filling onto the warm crust and tilt the pan instead of scraping across the base. That gentle handling keeps the shortbread intact and lets the lemon layer settle evenly.

Smooth lemon filling covers the lightly golden shortbread crust in a parchment-lined square pan.
The smooth lemon filling is poured over the lightly golden crust before its final bake.

Read the gentle jiggle

The lemon layer should look set at the edges while the center still moves slightly as one piece. It will continue to firm as it cools, so baking until completely rigid can leave the filling dry and less tender.

If the surface develops bubbles, the filling was likely whisked too vigorously or the oven ran hot. The bars will still be usable; cool them completely and dust with sugar before serving to soften the look.

Cool before cutting

Let the pan cool fully on a rack before chilling it. The short chill firms the filling enough for the parchment sling to lift the slab cleanly from the pan.

Use a clean knife for straight cuts and wipe it between slices when the filling clings. A light dusting of confectioners' sugar looks freshest when added just before the bars reach the table.

The cut edge reveals a smooth lemon layer set over a delicate, buttery shortbread base.
A cleanly cut bar shows the bright lemon layer resting on a thin shortbread base.

Lemon Bars

16 bars
180 minutes total

Ingredients

  • •  1 1/4 cups all-purpose flour
  • •  1/4 cup granulated sugar
  • •  1/4 tsp fine salt
  • •  1/2 cup unsalted butter, melted and cooled slightly
  • •  3 large eggs, at room temperature
  • •  1 cup granulated sugar
  • •  2 tbsp all-purpose flour
  • •  1 tbsp finely grated lemon zest
  • •  1/3 cup fresh lemon juice
  • •  2 tbsp confectioners' sugar

Method

  1. Prepare the pan and oven

    Heat the oven to 350 F and line an 8-inch square metal pan with a parchment sling, creasing the corners so the crust bakes evenly.

    Look for: Parchment covers the bottom and rises over two opposite sides for lifting.

  2. Mix the shortbread base

    Whisk 1 1/4 cups flour with 1/4 cup granulated sugar and 1/4 tsp salt, then stir in the melted butter until no dry patches remain and the mixture looks like soft crumbs.

    Look for: The crumbs hold together when pressed but do not look greasy.

  3. Press the crust

    Scatter the buttery crumbs in the lined pan and press them into an even layer, paying extra attention to the corners so the base bakes to a uniform thickness.

    Look for: The crust has a level surface with no loose floury pockets at the edges.

  4. Par-bake until pale gold

    Bake the crust at 350 F for 18 minutes, until the surface looks dry and the edges are just beginning to turn pale gold.

    Look for: The center is set and matte, while the edges have only a light golden tint.

  5. Whisk the lemon filling

    While the crust bakes, whisk the eggs and 1 cup sugar until smooth, then whisk in 2 tbsp flour, lemon zest, and lemon juice just until blended without whipping in much air.

    Look for: The filling is smooth and glossy, with no flour lumps or foamy cap.

  6. Add the filling

    Pour the lemon mixture over the warm par-baked crust, gently tilting the pan so the filling reaches every corner without disturbing the base.

    Look for: The filling forms an even layer and the crust remains intact beneath it.

  7. Bake until just set

    Return the pan to the 350 F oven and bake for 22 minutes, until the edges are set and the center gives a small, soft jiggle when the pan is nudged.

    Look for: The surface is no longer liquid and the middle moves slightly as one piece.

  8. Cool and chill

    Cool the pan completely on a rack, about 90 minutes, then chill the slab for 30 minutes so the filling firms and the bars cut cleanly.

    Look for: The pan no longer feels warm and the filling is firm to a light touch.

  9. Cut and finish

    Lift the slab out by the parchment, cut it into 16 bars with a clean knife, and dust the tops with confectioners' sugar just before serving.

    Look for: The lemon layer holds a sharp edge and the sugar stays bright and dry.