Classic Shortbread Lemon Bars
Servings: 16 bars Prep Time: 20 minutes Cook Time: 50 minutes Cooling Time: 30 minutes Total Time: 1 hour 40 minutes
Some recipes just lodge themselves in your heart and mind. The ones you think about even on a typical weekday afternoon, and suddenly you crave something you made months ago. These classic shortbread lemon bars are exactly one of those recipes.
They strike a wonderful middle ground—neither entirely a cookie nor fully a pie—but somehow the best of both worlds. Their base is a delicious, buttery shortbread that bakes up crisp and golden. On top is a smooth, silky lemon custard that’s so bright and tangy it almost takes you by surprise. The two together create something that’s truly hard to stop eating after just one piece.
If you’ve never made lemon bars from scratch before, this is the perfect place to start. And if you have? This recipe might just become your new standard.
Read: Lemon Pie Bars Recipe
What You’ll Need
For the Shortbread Crust:
- 1 cup all-purpose flour
- ½ cup unsalted butter, softened to room temperature
- ¼ cup confectioners’ sugar
- ¼ teaspoon vanilla extract
- ¼ teaspoon salt
For the Lemon Custard:
- 2 large eggs
- 1 large egg yolk
- 1 cup white sugar
- 2 tablespoons all-purpose flour
- ¼ cup freshly squeezed lemon juice
- 1 tablespoon freshly grated lemon zest
For the Finish:
- 1 teaspoon confectioners’ sugar, for dusting
Optional Meringue Topping:
- 1 egg white
- 1 tablespoon white sugar
You’ll also need an 8×8-inch baking dish, lightly greased, and a fork for docking the crust.
Step-by-Step Instructions
Step 1: Get Set Up
Place a rack in the middle of your oven and preheat it to 350°F (175°C). Lightly grease an 8×8-inch baking dish and set it aside.
Step 2: Make the Shortbread Crust
In a large bowl, combine the softened butter and flour. Use the back of a spatula or a wooden spoon to mash and mix them thoroughly until they’re completely blended—it takes a bit of effort, but it comes together quickly. Add the confectioners’ sugar, vanilla extract, and salt, and continue mixing until the dough feels like a lightly crumbly cookie dough. It shouldn’t be sticky, but when you press it lightly between your fingers, it should hold together.
Moisten your fingers slightly with water and press the dough evenly into the bottom of the prepared baking dish. Take your time here—an even layer means the crust will bake evenly. Prick the surface of the dough all over with a fork. This is called docking, and it prevents the crust from puffing up unevenly in the oven.
Step 3: Bake the Crust
Slide the pan onto the middle rack and bake until the edges are just barely golden brown — about 22 minutes. The center might still look pale, and that’s fine. It will continue cooking when the custard goes in. Remove from the oven and set aside. Leave the oven on.
Step 4: Make the Lemon Custard
When the crust is baking (or immediately afterward), prepare your filling. In a medium bowl, whisk the eggs and yolks until well combined. Add the granulated sugar and flour, and whisk vigorously until the mixture is completely smooth and free of lumps.
Add the fresh lemon juice and lemon zest, then beat for a full two minutes. This extra beating isn’t just for mixing—it helps the sugar dissolve completely and makes the custard even smoother.
Step 5: Pour and Bake
Pour the lemon custard over the hot crust. It will spread on its own—just tilt the pan slightly to ensure it reaches all four corners.
Return the pan to the oven and bake on the middle rack for about 25 minutes, until the custard is completely set. You’ll know it’s ready when the filling no longer wobbles in the center and a thin, light, sugary skin has formed on the surface. That delicate white crust on top is a good sign—it means the sugar has set beautifully.
Step 6: Cool Completely Before Cutting
Patience is required at this stage. Let the bars cool completely to room temperature before cutting—rushing this step leads to uneven cuts and the filling isn’t fully set yet. Give them at least 30 minutes, or longer if possible.
When you’re ready to cut, dip a sharp knife into very hot water, then run it along the edges of the pan to cut into 16 square pieces. The hot knife will glide cleanly through the custard without pulling or tearing. For a neat result, wipe the knife clean and dip it back in hot water after each cut.
Step 7: Dust and Serve
Just before serving, lightly dust it with confectioners’ sugar. A small, fine-mesh sieve is perfect for this—simply tap it gently over the bars to achieve an even, snow-like coating. Powdered sugar adds a subtle sweetness and makes the bars look glossy and attractive.
Optional: Add a Meringue Topping
Do you want to give these bars the perfect shape? A simple piped meringue makes them absolutely stunning and creates a soft, marshmallow-like contrast with the tart custard.
In a bowl, beat one egg white until it forms a ribbon. Add one tablespoon of granulated sugar and continue beating until the mixture forms soft peaks. Transfer it to a small resealable bag, snip off a corner, and pipe meringue onto each cut bar in your chosen pattern—curved lines, dots, or zigzags.
Then use a kitchen torch to lightly toast the meringue until it’s golden brown. The result will be so spectacular that you can serve it at a dinner party.
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