This easy lime bars recipe makes about 24 bright, buttery dessert squares in a 9-by-13-inch pan. A tender shortbread crust is baked until lightly golden, covered with a smooth fresh-lime custard, and baked again for a total bake time of 40 to 45 minutes.
Each bar has the perfect contrast of textures: a crumbly, rich crust beneath a silky filling that tastes sweet, tart, citrusy, and wonderfully refreshing. Use fresh lime juice and finely grated zest for the clearest flavor, then cool the bars for at least 2 hours before slicing for clean, bakery-style squares.
Jump to RecipeWhy You’ll Love This Recipe
These easy lime bars are the kind of dessert that looks elegant but requires no complicated pastry work. The crust comes together from four simple ingredients, and the filling needs only one bowl and a whisk.
The flavor is lively without being harsh. Lime juice brings a clean tartness, lime zest adds fragrant citrus oils, and the buttery shortbread keeps every bite balanced with a rich, delicate sweetness.
This recipe is also wonderfully practical for gatherings. One 9-by-13-inch pan makes about 24 bars, so there is plenty to share at picnics, showers, potlucks, afternoon teas, and holiday dessert tables.
- Texture: crumbly shortbread beneath a silky custard.
- Flavor: fresh, sweet-tart lime with a buttery finish.
- Serving: about 24 generously snackable squares.
- Skill level: simple enough for a first-time baker.
If you are planning a full spread of comforting recipes, these bars make a refreshing finish after savory favorites such as our crispy roasted potatoes.
Ingredients You’ll Need
The crust uses all-purpose flour, powdered sugar, softened unsalted butter, and a small amount of salt. Powdered sugar gives the shortbread a fine, tender crumb, while softened butter helps the mixture bind when pressed into the pan.
The lime custard combines granulated sugar, flour, eggs, fresh lime juice, lime zest, baking powder, and salt. The flour helps the filling set, while the eggs create its smooth, sliceable consistency.
- Fresh limes: You need 1/2 cup, or 120 ml, of juice. This usually takes about 4 to 6 regular limes or 8 to 10 Key limes.
- Regular or Key limes: Persian limes are the usual supermarket choice. Key limes taste more floral and slightly sharper.
- Softened butter: Let it soften before mixing so the crust blends evenly without greasy patches.
- Parchment paper: Leave an overhang on two sides to make lifting and cutting much easier.
- Finishing sugar: Keep powdered sugar ready for dusting immediately before serving.
Before you juice the limes, grate the zest. The green outer skin contains the fragrant oils you want; the white pith underneath is bitter and should be avoided.
For another easy sweet treat to serve alongside citrus bars, you can also prepare these light and fluffy beignets for a dessert table with plenty of variety.
How to Make It Step-by-Step
Step 1: Heat the oven to 350°F (175°C), then line a 9-by-13-inch baking pan with parchment paper. Leave enough paper hanging over the sides to act as handles once the bars are completely cool.
Step 2: Make the shortbread by beating or rubbing together the flour, powdered sugar, softened butter, and salt. Continue until the mixture looks like coarse crumbs and begins to hold together when pressed between your fingers.
Step 3: Transfer the crust mixture to the lined pan and press it firmly into an even layer. Pay special attention to the corners and edges, since an evenly packed crust supports the custard and helps every bar hold its shape.
Step 4: Bake the crust for 18 to 22 minutes, watching for lightly golden edges. It does not need to become deeply brown because it will return to the oven with the lime filling.
Step 5: While the crust bakes, whisk the granulated sugar, flour, baking powder, and salt in a bowl. Add the eggs, fresh lime juice, and lime zest, then whisk until the mixture is smooth and evenly combined.
Step 6: Pour the lime filling over the hot crust as soon as the crust is ready. Working while the crust is hot helps the filling adhere properly and prevents a separate layer from forming between the shortbread and custard.
Step 7: Return the pan to the oven and bake for 20 to 25 minutes. The center should be set around the edges with a slight, gentle wobble in the middle; it will continue setting as it cools.
Step 8: Cool the bars completely in the pan, then refrigerate them for at least 1 hour for cleaner cuts. Since the complete cooling recommendation is at least 2 hours, do not rush this stage if you want firm, neat squares.
Step 9: Lift the chilled slab from the pan using the parchment overhang and place it on a cutting board. Dust with powdered sugar, scatter over optional lime zest, and cut into squares, wiping the knife clean between slices.
Chef Tips for Perfect Lime Bars
The biggest flavor improvement comes from using fresh lime juice. Bottled juice can work in a pinch, but fresh juice has a brighter aroma and a more natural citrus finish.
Measure the juice after squeezing rather than relying only on the number of limes. Lime sizes vary, and you need exactly 1/2 cup, or 120 ml, for the filling to set and taste balanced.
- Zest first: Whole limes are easier to hold and zest before they become soft from juicing.
- Use a light touch: Grate only the green outer zest, stopping before the white pith.
- Press evenly: A flat-bottomed measuring cup can help compact the crust into the corners.
- Pour onto a hot crust: This is important for helping the custard bond to the shortbread.
- Watch the wobble: A slight movement in the center is correct; a completely firm filling may become overbaked.
- Chill before cutting: Cold bars are much easier to portion into clean squares.
For the sharpest edges, use a large chef’s knife and wipe the blade with a damp, clean cloth after each cut. Dust the bars just before serving, since powdered sugar can dissolve when it sits on the moist lime surface.
These bars are especially welcome after a rich meal. For a casual gathering, consider pairing them with a warm cheeseburger dip as part of a sweet-and-savory snack table.
Cooling, Cutting, and Serving
Cooling is not an optional waiting period; it is part of the recipe. The filling continues to set as it loses heat, and refrigeration gives the custard enough structure to slice without spreading.
Let the pan cool completely before refrigerating. Chill for at least 1 hour after cooling for cleaner cuts, while allowing at least 2 hours total cooling time before cutting and serving for the best texture.
Use the parchment handles to lift the full slab from the pan. Cut it into approximately 24 squares, or make smaller pieces if you are serving the bars as part of a large dessert selection.
- Dust with powdered sugar immediately before serving.
- Add a little finely grated lime zest for a fresh finishing note.
- Serve chilled for the firmest custard texture.
- Let individual bars stand briefly at room temperature if you prefer a softer bite.
The powdered sugar gives the surface a pretty snowy finish, while the zest adds a small burst of color. For a savory menu before dessert, our classic bread stuffing is another comforting choice for a shared meal.
Storage and Make-Ahead Advice
Because the lime filling is moist and custard-like, keep the finished bars refrigerated until you are ready to serve them. Cover the pan or transfer the cut bars to an airtight container so the crust stays fresh and the citrus aroma remains pleasant.
For the cleanest presentation, wait to add powdered sugar until serving time. Sugar placed on the bars too early can dissolve into the surface, especially while the bars are covered in the refrigerator.
- Make ahead: Bake and chill the bars before your gathering, then dust and garnish shortly before serving.
- Cutting: Chill thoroughly and wipe the knife between cuts.
- Transport: Keep the bars cold and flat so the custard remains neat.
- Serving: Arrange in a single layer on a platter for easy picking.
This make-ahead quality makes lime bars useful when the oven and kitchen are busy with other dishes. They can wait in the refrigerator while you prepare dinner, including a simple side of stovetop caramel apples for another sweet option.
Easy Lime Bars Recipe
Ingredients
Method
- Heat the oven to 350°F (175°C). Line a 9-by-13-inch pan with parchment paper, leaving enough overhang to lift out the cooled bars.
- Beat or rub together the flour, powdered sugar, softened butter, and salt until the mixture resembles coarse crumbs and begins to hold together. Press it firmly and evenly into the prepared pan.
- Bake the crust for 18 to 22 minutes, until the edges are lightly golden. While it bakes, whisk together the granulated sugar, flour, baking powder, and salt.
- Whisk the eggs, fresh lime juice, and lime zest into the sugar mixture until smooth. Pour the filling over the hot crust as soon as it comes from the oven.
- Return the pan to the oven and bake for 20 to 25 minutes, until the center is set but still has a slight, gentle wobble. Do not bake until the filling is completely firm.
- Cool the pan completely, then refrigerate the bars for at least 1 hour for cleaner cuts. For the best overall texture, allow at least 2 hours of cooling before serving.
- Lift the chilled bars from the pan using the parchment overhang. Dust with powdered sugar, add optional lime zest, and cut into squares with a clean knife.
Notes
Final Thoughts
When you want a dessert that is bright, dependable, and easy to share, these lime bars deserve a place in your baking rotation. The buttery shortbread crust takes only minutes to mix, and the fresh lime custard delivers a smooth sweet-tart flavor that feels both familiar and refreshing.
Remember the details that make the recipe work: zest before juicing, use fresh lime juice, bake the filling over the hot crust, and look for a gentle wobble in the center rather than a completely firm surface. Those simple steps produce bars with a tender base, creamy filling, and clean citrus flavor.
Give the finished pan at least 2 hours to cool, chill it thoroughly for neat slices, and add powdered sugar right before serving. Once you taste that crisp shortbread and silky lime center together, you will understand why this classic dessert is so easy to love.
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