Fresh lemon juice and a buttery shortbread crust come together in just 55 minutes to create these gluten free lemon bars—the kind of dessert that tastes like spring in every bite, no fancy equipment required.
⚡ Quick Recipe Snapshot: Prep: 15 min | Cook: 40 min | Total: 55 min (plus 2 hours chill) | Difficulty: Medium | Cuisine: American | Calories: 292 per bar | Season: Anytime | Yield: 9–12 bars
Why This Recipe Works
- Two-layer magic: A golden, buttery gluten free shortbread base stays crispy while the tangy custard topping sets into a chewy, lemon-forward dream.
- Real lemon juice, real flavor: Freshly squeezed juice (not bottled) gives these bars that bright, authentic citrus punch that makes people ask for the recipe.
- Weeknight-friendly: Mix, bake, chill—no rolling, no piping, no stress. Perfect for potlucks, picnics, or just because you deserve something special.
Grocery List (& Shortcuts)
Main Players:
- 1 2/3 cups gum-free gluten free flour blend
- 1/2 cup confectioners’ sugar (plus more for dusting)
- 1/2 teaspoon kosher salt
- Zest of 1 large lemon
- 9 tablespoons unsalted butter (melted and cooled)
- 4 eggs (at room temperature)
- 1 cup granulated sugar
- 3/4 teaspoon baking powder
- 2/3 cup freshly squeezed lemon juice (juice of 4–5 lemons)
Smart Shortcut: No fresh lemons on hand? Bottled lemon juice works in a pinch, though the flavor won’t be quite as bright. Use about 2/3 cup and taste as you go.
Substitutions & Swaps:
- Gluten free flour: Use your favorite gum-free blend (Bob’s Red Mill 1-to-1 works beautifully). Avoid blends with xanthan gum if you’re sensitive.
- Dairy-free: Swap butter for dairy-free butter in a 1:1 ratio. The bars will be slightly less rich but still delicious.
- Eggs: Room-temperature eggs blend more smoothly. Let them sit on the counter for 15 minutes before you start.
Step-by-Step
Prep & Crust
Preheat your oven to 325°F. Grease an 8-inch square baking pan, then line it with criss-crossed parchment paper that overhangs the sides (this makes removal a breeze). Grease the parchment too, and set aside.
In a medium bowl, whisk together 1 cup of the gluten free flour, confectioners’ sugar, salt, and lemon zest, breaking up any clumps as you go. Add the melted butter and mix with a fork until the mixture looks like damp sand. Press it evenly into the bottom of your prepared pan—don’t worry about perfection; rustic is beautiful here.
Bake the crust for about 15 minutes, until it feels firm to the touch and smells toasty. Remove from the oven and let it cool for just a minute or two.
Custard & Bake
While the crust cools, combine the room-temperature eggs, granulated sugar, baking powder, lemon juice, and remaining 2/3 cup flour in a medium bowl. Whisk vigorously after each addition until smooth and well-blended—this is where the magic happens. The mixture should be pale and slightly frothy.
Pour the custard over your warm crust. Return the pan to the oven and bake for about 25 minutes. The bars are done when the custard no longer jiggles more than a tiny bit when you gently shake the pan. The center should look just barely set, not dry.
Chill & Serve
Remove from the oven and let cool in the pan for about 20 minutes. Transfer to the refrigerator and chill for at least 2 hours (overnight is even better—this helps the bars set properly and makes them easier to slice).
Run a thin knife or spatula around the edges, then lift the whole thing out using the parchment paper overhang. Dust generously with confectioners’ sugar and slice into 9 large or 12 smaller squares with a sharp knife. Serve chilled, and watch them disappear.
Nadia’s Tips
- Texture matters: Don’t overbake the custard layer. It should jiggle just a hair in the center when the pan moves—that slight wobble becomes the perfect chewy texture as it cools. Overbaked bars turn rubbery, so trust the gentle shake test.
- Oops, I squeezed too many lemons: If your lemon juice is more than 2/3 cup, use what the recipe calls for and save the rest for lemonade. Too much juice can make the custard too wet and prevent it from setting properly.
- Make-ahead magic: These bars actually taste better the next day. The flavors meld, and the texture becomes perfectly chewy. Bake them the day before your event, wrap them in parchment, and refrigerate. They’ll keep for up to 4 days.
Storage & Leftovers
Fridge: Store these bars in an airtight container on a parchment-lined layer for up to 4 days. They taste best served cold straight from the fridge.
Freezer: Wrap individual bars tightly in plastic wrap and freeze for up to 3 months. Thaw in the fridge for a few hours before serving. The texture stays lovely.
Reheating: These are best enjoyed cold, but if you prefer them at room temperature, let them sit on the counter for 15–20 minutes before serving.
Can I use a different size pan?
An 8-inch square pan is key here—it gives you the right thickness for that perfect ratio of crust to custard. A 9-inch pan will make thinner bars that bake faster (watch them closely after 20 minutes). Avoid larger pans, as the custard may not set properly.
What if my gluten free flour blend has xanthan gum?
If it does, reduce the amount by about 1/4 teaspoon, since xanthan gum can make the bars gummy. Gum-free blends are ideal for this recipe, but most home cooks won’t notice a huge difference.
Why didn’t my bars set?
The most common culprit is overbaking the crust or underbaking the custard layer. Make sure your oven temperature is accurate (use an oven thermometer if you suspect it runs hot or cold), and trust the jiggle test—just a tiny wobble in the center is perfect.
Can I make these dairy-free?
Yes! Swap the butter for dairy-free butter in equal amounts. The bars will be slightly less rich, but they’ll still be delicious and tangy.
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Save This Recipe & Tell Me How It Went!
These gluten free lemon bars are the kind of dessert that brings people together—bright, a little tart, and totally craveable. Whether you’re baking for a crowd or just treating yourself, I’d love to hear how they turn out. Drop a comment below, save this recipe to your collection, and let me know if you added any fun twists of your own. Happy cooking! — Nadia
Gluten Free Lemon Bars
Equipment
- baking pan
- Mixing Bowl
- Whisk
Ingredients
Main
- 1 2/3 cups gum-free gluten free flour blend
- 1/2 cup confectioners’ sugar plus more for dusting
- 1/2 teaspoon kosher salt
- 1 large lemon zest
- 9 tablespoons unsalted butter melted and cooled
- 4 eggs at room temperature
- 1 cup granulated sugar
- 3/4 teaspoon baking powder
- 2/3 cup freshly squeezed lemon juice (juice of 4–5 lemons)
Instructions
Instructions
- Preheat your oven to 325°F.
- Grease an 8-inch square baking pan and line it with criss-crossed parchment paper.
- In a medium bowl, whisk together 1 cup of the gluten free flour, confectioners’ sugar, salt, and lemon zest.
- Add the melted butter and mix until it resembles damp sand.
- Press the mixture evenly into the bottom of the baking pan.
- Bake for about 15 minutes until firm to the touch.
- Let the crust cool for 1-2 minutes.
- While the crust cools, combine the room-temperature eggs, granulated sugar, baking powder, lemon juice, and remaining flour in a bowl.
- Whisk vigorously until smooth and slightly frothy.
- Pour the custard over the warm crust and bake for about 25 minutes.
- The custard should not jiggle too much when you shake the pan.
- Let it cool in the pan for about 20 minutes, then chill in the refrigerator for at least 2 hours.
- Dust with confectioners’ sugar and slice into squares.
- Serve chilled.