Bakery-Style Lemon Bars with Buttery Shortbread Crust

Directions

1. Prepare the lined pan

   Heat the oven to 350°F with a rack in the center. Lightly grease a light-colored metal 9-by-13-inch pan. Line it with a parchment sling that covers the bottom and two long sides, leaving enough overhang to lift the slab later.

2. Press an even shortbread crust

   Whisk the melted butter, 1/2 cup confectioners’ sugar, 2 teaspoons lemon zest and 1/2 teaspoon salt. Stir in 2 cups flour until no dry pockets remain. Drop small clumps across the pan, then press into an even compact layer, reaching every corner without building a thick rim. Chill for 10 minutes.

3. Blind-bake until golden

   Bake the crust for 20 to 22 minutes, rotating once, until the surface looks dry and the edges are pale gold. During the final 5 minutes, whisk the granulated sugar, 1/3 cup flour and 1/4 teaspoon salt in a large bowl.

4. Whisk a smooth lemon filling

   Add the eggs to the sugar mixture and whisk gently until completely smooth but not foamy. Whisk in the lemon juice and 2 tablespoons zest. Pour through a fine-mesh sieve into a large measuring jug to remove zest clumps, chalazae and excess bubbles.

5. Fill the crust while hot

   With the pan still on the oven rack, pull the rack out partway and pour the filling over the hot crust. Slide the rack in gently. The hot crust begins sealing the two layers together and reduces the chance of a soggy boundary.

6. Bake to a soft set

   Bake for 22 to 25 minutes, until the edges are set and the center moves as one slight wobble rather than rippling. An instant-read thermometer inserted near the center should register at least 160°F but ideally no more than 170°F; overheating causes a rubbery, cracked top.

7. Cool and chill completely

   Cool in the pan on a rack for 1 hour. Cover without touching the surface and refrigerate for at least 2 hours. This cooling time is included in the total and is essential for neat, stable slices.

8. Cut bakery-clean squares

   Run a thin knife around the unlined edges, lift out the slab by the parchment and trim only if desired. Use a long sharp knife to cut 24 rectangles, wiping and warming the blade under hot water between cuts. Dust evenly with 2 tablespoons confectioners’ sugar just before serving, matching the photographed finish.

Why this works

Swaps & notes

Easy swaps

• For lime bars, replace the lemon juice and zest measure-for-measure with fresh Persian lime juice and zest; the flavor will be sharper and slightly more floral.
• Use a glass 9-by-13-inch dish only if needed. Reduce the oven to 325°F, expect several extra minutes and let the dish cool away from cold surfaces to avoid thermal shock.
• For a less snowy finish, omit the final confectioners’ sugar and garnish each chilled bar with one very thin strip of lemon zest.

Cook notes

• Zest the lemons before juicing, removing only the fragrant yellow surface; bitter white pith will muddy the clean citrus flavor.
• Room-temperature eggs blend with the juice more smoothly. To warm cold eggs quickly, place them in a bowl of warm tap water for 5 minutes and dry before cracking.
• The licensed photograph shows a grid of golden lemon squares on a blue plate beneath confectioners’ sugar; this recipe uses the same square form, shortbread base and powdered finish.

Storage

Refrigerate the cut bars in a single layer or with parchment between layers for up to 5 days. Let them stand 10 minutes before serving for the best texture, then refresh the sugar because refrigeration dissolves it. Freeze undusted bars tightly wrapped for up to 2 months; thaw overnight in the refrigerator and dust after thawing.

Questions