Bakery Images are for illustrative purposes only, may be inaccurate, and do not guarantee the presence or absence of specific ingredients. Lemon Bars
A buttery shortbread crust topped with a bright, tangy lemon custard and a snowfall of powdered sugar.
Contains common allergens
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Instructions
5 steps- 1
Preheat the oven to 350°F and line a 9x13-inch pan with parchment, then beat the softened butter with the 1/2 cup powdered sugar until creamy and mix in 1 3/4 cups of the flour until a soft crumbly dough forms.
- 2
Press the dough firmly into an even layer across the bottom of the pan and bake for 18 to 20 minutes until the edges are lightly golden and the crust is set.
- 3
While the crust bakes, whisk the eggs, granulated sugar, lemon juice, lemon zest, salt, and the remaining 1/4 cup flour together until completely smooth and uniform.
- 4
Pour the lemon filling over the hot crust as soon as it comes out of the oven, then return to the oven and bake for another 20 to 22 minutes until the center is just set and no longer jiggly.
- 5
Cool completely in the pan, then refrigerate for at least 1 hour for clean slices, dust generously with powdered sugar, and cut into squares.
Listahan Family Score™
68/100
Works for many families
Score reflects how well this recipe fits a typical busy household. In the app, your Family Score is personalized to your household's allergens, kids, and pantry.
Nutrition
per serving550
Calories
7 g
Protein
75 g
Carbs
26 g
Fat
Estimated per serving. Actual values depend on the brands and portions you use.
Listahan cooking guide
Chef notes & practical guide
Technique notes, ingredient swaps, serve-alongside ideas, storage guidance, and equipment for this recipe.
Cultural context
Lemon bars are a mid-20th-century American bakery classic, combining a buttery shortbread crust with a tangy baked lemon custard, finished with a dusting of powdered sugar. Their two-stage bake, crust first and then filling, became the standard technique that home bakers still rely on today.
Listahan note
This version pours the lemon filling over the crust the moment it comes out of the oven, which helps the two layers bond rather than separate cleanly when the bars are cut.
Technique cues
- Pressing the shortbread dough firmly and evenly into the pan prevents thin spots that can turn overly crisp or burnt during the crust's own bake.
- Pouring the lemon filling over the crust as soon as it comes out of the oven, while both are hot, helps the layers meld at the seam instead of separating when sliced.
- Refrigerating the fully cooled bars for at least an hour firms up the custard filling enough to cut clean squares instead of a filling that smears under the knife.
Kitchen flow
- Parallel prep
- Whisk the lemon filling together while the crust bakes, so it's ready to pour the moment the crust comes out hot.
- Make-ahead
- Lemon bars are ideal make-ahead treats; they slice more cleanly after a full day chilled in the fridge.
- Leftover move
- Crumble leftover bars over vanilla yogurt or ice cream for a quick dessert twist.
- Cleanup rhythm
- Line the pan with parchment before starting so the whole slab lifts out cleanly for slicing, rather than cutting in the pan.
Ingredient brief
Role, handling, and swap guidance for each key ingredient.
Unsalted butter
Crust fat
Purpose: Creamed with powdered sugar and flour, it forms the tender, crumbly shortbread base.
Handling: Soften fully before creaming so it blends smoothly into a cohesive dough.
Adaptation: There isn't a great substitute here; butter's flavor and texture are essential to a proper shortbread crust.
Fresh lemon juice and zest
Filling flavor
Purpose: Together they give the filling its bright, tangy character; zest in particular carries much of the aromatic lemon oil.
Handling: Zest the lemons before juicing them, since it's much harder to zest a juiced, floppy lemon.
Adaptation: Bottled lemon juice can work in a pinch but lacks the aromatic brightness of fresh zest and juice.
Eggs
Custard setter
Purpose: Whisked with the sugar and lemon juice, eggs set the filling into a sliceable custard as it bakes.
Handling: Whisk thoroughly with the other filling ingredients until completely smooth before pouring over the hot crust.
Adaptation: There's no good substitute for eggs here; they're what gives the filling its custard-like set.
Granulated sugar
Sweetener
Purpose: It balances the sharp lemon juice, giving the filling its classic sweet-tart profile.
Handling: Whisk fully into the eggs and lemon juice so it dissolves rather than leaving a gritty texture.
Adaptation: There isn't a strong reason to substitute here; the sugar level is central to balancing the tartness.
Technique notes
- Bake the crust until just golden at the edges before adding the filling; an underbaked crust can turn soggy under the wet filling.
- Bake the filling only until the center is just set and no longer jiggly; overbaking can cause it to puff and crack.
- Chill thoroughly before slicing; warm or room-temperature bars are much more likely to smear when cut.
Ingredient swaps
- Different citrus direction
- Lime or a mix of lemon and lime can replace straight lemon juice for a different citrus profile.
- Gluten-free direction
- A cup-for-cup gluten-free flour blend can replace the all-purpose flour in the crust with reasonable results.
- Extra zesty direction
- Add extra lemon zest to the crust itself for a more lemon-forward bar throughout.
Serve alongside
- Fresh berries
- Whipped cream
- Mint tea
- Iced tea
- Sparkling water with lemon
- Coffee
Serving suggestions only — check pairings for your household's allergens.
Storage & reheating
- Refrigerate in an airtight container for up to 5 days.
- Serve chilled or at cool room temperature; the bars are meant to be eaten cold or barely cool, not reheated.
- Freeze uncut bars for up to 2 months; thaw in the fridge before dusting with fresh powdered sugar and slicing.
Equipment
- 9x13-inch baking pan
- Parchment paper
- Whisk
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