Gluten-Free Lemon Bars Recipe with Tangy Shortbread Crust

Gluten Free Lemon Bars are a classic summer dessert—perfect for potlucks and barbecues. A tender almond shortbread crust, topped with a thick, silky lemon custard and finished with a dusting of powdered sugar, these bars are bright, tart, and satisfyingly buttery.

Recipe Ingredients Notes

Gluten Free Flour: For the shortbread crust use a reliable gluten-free multipurpose blend. This recipe works with many blends (the crust is forgiving); many blends include xanthan gum.

Almond Flour: Finely ground almond flour adds a nutty depth that complements the lemon filling. For a nut-free version substitute an equal amount of gluten-free flour.

Butter: Use unsalted butter at room temperature (around 65°F). The butter should give slightly when pressed but not be overly soft.

Eggs: This recipe uses whole eggs plus extra yolks for a rich, smooth filling without an overly eggy flavor. Save leftover whites for meringues or spiced pecans.

Lemons: Fresh lemon juice and zest give the cleanest, brightest flavor—organic lemons are ideal if you plan to use the zest. Rinse fruit before zesting and juicing.

Heavy Cream: A small amount of heavy cream stirred into the cooked curd adds extra creaminess. For a dairy-free option substitute canned coconut cream.

Tools needed to make Lemon Squares

Essential tools: an 8×8-inch baking pan (a 9-inch pan will yield thinner bars), a heavy non-reactive saucepan (stainless steel or enamel), a zester, juicer, whisk, heatproof spatula, fine mesh strainer and a bowl to strain into, plus a small offset knife and a sharp chef’s knife for slicing.

Almond Shortbread Crust

Make sure butter is at the proper room temperature (slightly yielding but not soft). Preheat the oven to 350°F and place the rack in the center.

Step 1: Line an 8×8-inch pan with parchment, leaving an overhang for easy removal.

Step 2: In a medium bowl whisk together gluten-free flour, almond flour, powdered sugar, and a pinch of salt. Optionally add ½–1 teaspoon vanilla.

Step 3: Cut the butter into small pieces and work it into the dry ingredients with your hands or two forks until the mixture is crumbly and comes together into a rough dough.

Step 4: Press the dough evenly into the prepared pan, getting into the corners and smoothing the top with an offset knife or the back of a spoon.

Step 5: Bake at 350°F for 13–14 minutes, until the crust is lightly golden. If it puffs while baking, smooth it back down immediately after removing from the oven.

Step 6: Reduce the oven temperature to 325°F and keep the oven on for the lemon filling step.

How to make Lemon Curd Filling and bake Lemon Bars

Pre-cooking the filling on the stovetop yields the best texture and helps prevent the edges from overbaking while the center sets.

Step 1: In a nonreactive bowl whisk together the granulated sugar, whole eggs, egg yolks, and salt—do not overbeat; the mixture should not be frothy.

Step 2: Quickly whisk in fresh lemon juice, then transfer the mixture to a nonreactive saucepan set over medium heat to finish cooking. The lemon juice begins to “cook” the eggs, so move swiftly.

Step 3: Whisk in butter and lemon zest and stir constantly until the curd thickens, about 5–10 minutes. Do not allow it to boil. The curd is ready when it coats the back of a spoon and leaves a clear path when you run your finger through it.

Step 4: Pour the curd through a fine mesh strainer into a clean non-reactive bowl to remove any cooked egg bits and excess zest. Stir in the heavy cream until fully incorporated.

Step 5: Pour the warm lemon curd over the still-warm shortbread crust and smooth the top with the back of a spoon or a small offset knife.

Step 6: Bake at 325°F for 13–15 minutes, until the filling looks glossy and the center jiggles slightly like firm Jell-O when the pan is nudged. Some bubbling along the edges is normal.

Step 7: Cool the bars completely on a wire rack, then refrigerate for 2–3 hours or overnight to fully set before slicing.

How to serve Lemon Bars

Chill the bars thoroughly (about 2 hours) before cutting. Use a long, very sharp knife warmed in hot water and wiped dry between cuts to get clean slices. Dust with powdered sugar and serve with whipped cream and lemon slices if desired.

Storing & Freezing

Store bars in an airtight container in the refrigerator for up to one week. They may sit at room temperature up to four hours if serving. Freeze for up to three months; thaw in the refrigerator before serving.

Why do Gluten Free Lemon Bars have a white crust on top?

A pale, bubbly top can occur if the eggs were overwhisked when combined with the sugar. It won’t affect the flavor—simply dust with powdered sugar before serving to disguise any surface bubbles.

FAQ for Lemon Bars

Note about Salt in my Recipes

Different salts have different strengths. Adjust amounts if you use a finer or coarser variety than called for.

Baking in grams

Baking by weight is more accurate—use a digital scale for best results. Small differences in flour weight can affect texture, especially in gluten-free baking.

Note about Ovens and Oven Temperatures

Recipes are tested in a conventional oven with the bakeware placed in the middle rack. If using convection, reduce temperature or monitor baking time closely. An oven thermometer can help ensure accurate temperatures.

Substitutions and Modifications

Ingredient substitutions may change texture and flavor. If you alter the recipe (different flours, dairy-free swaps, etc.), expect some variation in results.

More Gluten Free Lemon Desserts to try