Gluten Free Lemon Bars: Buttery, Tangy, and Easy

These gluten free lemon bars are all about the contrast: a tender, buttery shortbread crust and a silky lemon curd that lands right between sweet and puckery. They use simple ingredients and come together without any fussy steps.

If you thought a great lemon bar needed wheat flour, this one will change your mind. The crust stays intact when you lift it, and the filling sets up glossy and sliceable, no grit in sight.

Why These Lemon Bars Stay in Rotation

The filling is what gets me every time. Fresh lemon juice and plenty of zest make it sharp and bright, while the sugar rounds the edges just enough. It tastes like lemon should.

That buttery crust is the other half of the equation. It holds its shape under the curd without turning dense, and the contrast of the crisp base with the soft topping makes each bite work.

I also love that you can make a pan ahead and just forget about them in the fridge. They get a little firmer and the lemon flavor deepens overnight, which makes them a solid contender for parties or Sunday meal prep.

Ingredients

For the shortbread crust

• 1 cup gluten free all-purpose flour blend: a measure-for-measure blend with xanthan gum, like Bob’s Red Mill 1-to-1, gives the crust structure
• 1/4 cup granulated sugar
• 1/4 tsp fine sea salt
• 1/2 cup cold unsalted butter, cut into small cubes: cold butter creates a tender, short crust

For the lemon filling

• 4 large eggs: room temperature eggs blend into the smoothest curd
• 1 cup granulated sugar
• 2 tbsp lemon zest: from about 2 lemons, finely grated
• 1/2 cup freshly squeezed lemon juice: roughly 3 to 4 lemons; fresh makes a big difference here
• 1/4 cup gluten free all-purpose flour blend: this thickens the curd; cornstarch works too for a slightly clearer set
• Powdered sugar, for dusting

Variations and Swaps

• Lime or orange bars: use the same amount of lime or orange juice and zest for a citrus twist; the lime version is especially bright.
• Dairy-free: swap the butter for a firm plant-based butter stick; the filling is already dairy-free.
• Less sweet: cut the sugar in the filling to 3/4 cup for a sharper lemon punch.
• Cornstarch thickener: use 3 tbsp cornstarch in place of the flour in the filling for an even glossier top.

If you love citrus desserts, try our Gluten Free Lemon Poppy Seed Muffins.

How to Make Gluten Free Lemon Bars

Step 1: Press the Shortbread Crust

Preheat your oven to 350°F (175°C) and line an 8×8‑inch baking pan with parchment paper, leaving a little overhang on two sides. In a medium bowl, stir together the 1 cup gluten free flour, 1/4 cup sugar, and 1/4 tsp salt. Drop in the 1/2 cup of cold butter cubes and cut them in with a pastry blender or your fingertips until the mixture looks like damp sand and holds together when squeezed.

Tip the crumbs into the prepared pan and press them firmly into an even layer, going all the way to the edges. The back of a measuring cup helps compact it smoothly. You want a solid, packed base so the crust doesn’t crumble later.

Step 2: Parbake the Crust

Slide the pan into the oven and parbake the crust for 15 minutes, until the edges are just starting to turn a pale golden color and the surface looks dry and set. The middle will still be very light, which is exactly right.

If the crust puffed up a little during baking, don’t worry; it will settle as it cools. You can gently prick any bubbles with a fork if they appear.

Step 3: Whisk the Lemon Filling

While the crust is in the oven, crack the 4 eggs into a mixing bowl and whisk them until they’re well combined. Add the 1 cup sugar, 2 tbsp lemon zest, and 1/2 cup lemon juice and whisk until the mixture is smooth and the sugar mostly dissolves, about a minute. Sprinkle in the 1/4 cup gluten free flour and whisk again until no lumps remain.

You’ll have a thin, sunny-yellow liquid that smells intensely of lemon. The flour will look a little cloudy at first but blends in completely as you whisk.

Step 4: Bake the Bars Until Set

When the crust comes out of the oven, give the filling one last whisk and pour it right over the hot crust. This helps the layers bond. Return the pan to the oven and bake for 18 to 22 minutes. The bars are done when the center barely jiggles if you give the pan a gentle nudge, it should move as one mass, not slosh.

Keep an eye on the edges; the filling will puff slightly and turn matte. If the center still looks liquid, give it 2 more minutes. The bars will finish setting as they cool, so a little jiggle is better than overbaking.

Step 5: Slice and Dust with Powdered Sugar

Remove the pan from the oven and let the bars cool completely on a wire rack. Once they reach room temperature, lift the whole block out using the parchment overhang and set it on a cutting board. Slice into 16 squares with a sharp knife, wiping the blade between cuts for clean edges.

Dust the tops generously with powdered sugar right before serving. The sugar dissolves on contact with any humidity, so a last-minute dusting looks the prettiest.

A Few Tips for the Best Lemon Bars

• Use freshly squeezed lemon juice. Bottled juice can have a flat, metallic taste that comes through in a simple lemon bar.
• Bring your eggs to room temperature before you start; cold eggs can make the butter in the curd seize up slightly and create a less silky texture.
• For the cleanest slices, chill the completely cooled bars in the fridge for an hour before cutting. A sharp knife wiped clean after each cut keeps the layers distinct.
• If your gluten free flour blend doesn’t include xanthan gum, add 1/4 tsp to the crust mixture to help it bind.

Storing Leftover Lemon Bars

Keep the bars in an airtight container in the refrigerator, with sheets of parchment between layers, for up to 5 days. They taste even better on day two as the lemon flavor mellows and the crust softens just a touch. You can also freeze them for up to 3 months; thaw overnight in the fridge before serving. Dust with powdered sugar after they come to room temperature.

Frequently Asked Questions

Can I use almond flour for the crust?

No, almond flour will make the crust oily and crumbly. Stick with a measure-for-measure gluten free flour blend that contains xanthan gum for the right structure.

Why did my filling separate or turn watery?

Separation usually means the bars were underbaked. Bake until the center only wobbles slightly as one piece, and always let them cool completely before slicing. Chilling the cooled bars helps the curd firm up further.

Can I make these dairy-free?

Yes. Use a firm plant-based butter stick in place of the butter for the crust. The lemon filling is already dairy-free.

Can I halve the recipe?

Yes. Use an 8×4‑inch loaf pan and halve all the ingredients. Parbake the crust for about 12 minutes and then bake the filled bars for 15 to 18 minutes, watching for that gentle jiggle.