Name: Lemon Bars
Prep time: 30 min
Cook time: 45 min
Total time: 4 h 15 min
Cuisine: American
Ingredients: 2½ cups all-purpose flour (300 g); ⅔ cup powdered sugar (66 g), plus additional powdered sugar for dusting; ½ teaspoon salt; 12 tablespoons unsalted butter, melted (170 g); Optional splash of vanilla extract; ½ cup all-purpose flour (60 g); 3 tablespoons lemon zest, from about 3 lemons; 3 cups granulated sugar (600 g); 8 large eggs, at room temperature; 1 cup fresh lemon juice (240 mL)

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These homemade lemon bars are one of my favorite desserts when I want something bright, buttery, and refreshing. I start with a tender shortbread crust and top it with a smooth lemon filling made with fresh lemon juice and zest. The contrast between the buttery base and tangy citrus layer gives every bite a wonderful balance of sweet and tart flavors. I finish the chilled bars with a generous dusting of powdered sugar for a simple, classic presentation.

Ingredients

(Tip: You'll find the full list of ingredients and measurements in the recipe card below.)

For the crust:

2½ cups all-purpose flour (300 g)

⅔ cup powdered sugar (66 g), plus additional powdered sugar for dusting

½ teaspoon salt

12 tablespoons unsalted butter, melted (170 g)

Optional splash of vanilla extract

For the lemon filling:

½ cup all-purpose flour (60 g)

3 tablespoons lemon zest, from about 3 lemons

3 cups granulated sugar (600 g)

8 large eggs, at room temperature

1 cup fresh lemon juice (240 mL)

Directions

I preheat my oven to 350°F (175°C) and line a 9x13-inch baking dish with parchment paper. I leave enough parchment extending over the sides to make removing the chilled bars easier.

In a large bowl, I whisk together 2½ cups of flour, the powdered sugar, and salt. I pour in the melted butter and mix everything until a soft dough forms. If I want a subtle vanilla flavor, I also add a small splash of vanilla extract.

I press the dough evenly across the bottom of my prepared baking dish, making sure the thickness is as uniform as possible. I bake the crust for about 20 minutes, or until it is lightly golden.

While my crust is baking, I place the granulated sugar and lemon zest in a food processor and pulse until the zest is thoroughly incorporated and the sugar becomes pale yellow. If I am not using a food processor, I finely mince the zest and rub or mix it thoroughly into the sugar.

I transfer the lemon sugar to a large bowl and mix in the remaining ½ cup of flour until evenly combined.

I add the fresh lemon juice and room-temperature eggs. I whisk thoroughly until my lemon filling is completely smooth and everything is well incorporated.

As soon as the crust is ready, I carefully pour the lemon filling over the warm crust. I return the baking dish to the oven and bake for about 25 minutes, rotating the pan halfway through, until the lemon layer is set.

I let the lemon bars cool at room temperature for about 1 hour. I then transfer them to the refrigerator and chill for at least 2 hours so the filling can firm completely.

Before serving, I dust the top generously with powdered sugar. For clean slices, I use a sharp knife dipped in water and wipe and rewet the blade between cuts.

Servings and Timing

This recipe makes approximately 15 servings, with each serving containing about 340 calories.

Prep time: 30 minutes

Cooking time: 45 minutes

Cooling and chilling time: approximately 3 hours

Total time: 4 hours 15 minutes

Servings: 15

Calories: approximately 340 kcal per serving

I make sure to include the chilling time when planning this recipe. Although the hands-on preparation is relatively quick, allowing the lemon layer to cool and chill thoroughly gives me cleaner slices and the best texture.

Variations

For a stronger citrus flavor, I sometimes increase the amount of lemon zest slightly while keeping the lemon juice the same. This intensifies the lemon aroma without adding too much additional liquid to the filling.

When I want a different citrus profile, I can replace part of the lemon juice and zest with lime or orange. A lemon-lime combination creates a sharper citrus flavor, while adding orange makes the bars slightly sweeter and more aromatic.

I can also add vanilla extract to the shortbread crust for a warmer flavor. For a decorative finish, I sometimes skip the heavy powdered-sugar coating and add only a light dusting immediately before serving.

For smaller portions, I cut the chilled dessert into bite-sized squares instead of traditional rectangular bars. I find these especially convenient when I am serving several desserts at a party.

Storage/Reheating

I store leftover lemon bars in an airtight container in the refrigerator. I separate multiple layers with parchment paper so the bars do not stick together. For the best texture and flavor, I prefer to eat refrigerated lemon bars within about 4 to 5 days.

If I want to store them longer, I freeze the bars after they have completely cooled and chilled. I wrap individual pieces well and place them in a freezer-safe container. I prefer adding powdered sugar after thawing rather than before freezing because the sugar can absorb moisture during storage.

I do not reheat these lemon bars because the filling is best served chilled or slightly cool. If I have frozen them, I thaw them in the refrigerator before serving. I can also leave refrigerated bars at room temperature briefly if I prefer a slightly softer texture.

FAQs

How do I know when my lemon bars are finished baking?

I look for a filling that appears set rather than liquid in the center. A slight jiggle is fine when I gently move the pan, since the filling continues to firm as the bars cool and chill. I avoid baking until the filling becomes heavily browned.

Why do I pour the lemon filling over a warm crust?

I pour the filling onto the warm, prebaked crust so I can continue baking the two layers together immediately. Prebaking also gives my shortbread base time to develop structure before I add the liquid lemon mixture.

Can I use bottled lemon juice?

I prefer fresh lemon juice because it provides the bright, clean citrus flavor I want in homemade lemon bars. Fresh lemons also give me the zest required for the recipe, which contributes a significant amount of lemon aroma and flavor.

Why do my lemon bars need to chill before slicing?

I chill my lemon bars because the filling becomes firmer as it cools. If I slice them while they are still warm, I am more likely to get soft, messy pieces. At least 2 hours in the refrigerator after the initial cooling period gives me much cleaner slices.

How do I get clean cuts when slicing lemon bars?

I wait until my bars are completely chilled before cutting them. I use a clean, sharp knife dipped in water, then wipe the blade clean and wet it again between cuts. I find this simple technique prevents filling and crumbs from building up on the knife and gives each bar neater edges.

Conclusion

These homemade lemon bars give me everything I want from a classic citrus dessert: a buttery shortbread crust, a silky lemon filling, plenty of fresh citrus flavor, and a delicate powdered-sugar finish. The sweetness of the crust and filling balances the tart lemon beautifully, while chilling creates a firm yet tender texture.

I especially like making these bars when I need a dessert that I can prepare in advance. Whether I serve them for a family gathering, afternoon treat, party, or special occasion, their bright lemon flavor makes them a refreshing alternative to heavier desserts.