Keto Lemon Bars Recipe with Almond Flour Crust

Name: Keto Lemon Bars
Prep time: 4 h 20 min
Cook time: 30 min
Total time: 4 h 50 min
Cuisine: American
Ingredients: 1 1/2 cups macadamia nuts; 6 tablespoons butter, melted; 3 tablespoons Swerve confectioners sweetener; 4 large eggs; 4 egg yolks; 3/4 cup Swerve confectioners sweetener, divided; 1/2 cup fresh lemon juice; 1 tablespoon lemon zest; 1 teaspoon xanthan gum; 1/4 teaspoon salt; 2 tablespoons butter; Powdered Swerve confectioners, for dusting

By:

Ruby Bennett

Published:

May 29, 2026

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Keto Lemon Bars for the Win!

You will fall in love with the contrast between sweetness and that punchy lemony tang. These keto lemon bars are one of my favorite sugar-free summer desserts, and with just 2 net carbs a bar, I can enjoy them all year long. My husband doesn’t like lemon desserts at all – I’m totally fine with that, because it means I get every last bar to myself. I even freeze extra squares and eat them straight from the freezer when the craving hits. They’re still delicious semi-frozen, with a creamy, almost cheesecake-like texture.

Can you believe a low-carb treat can taste this rich and buttery? The macadamia nut crust bakes up golden and crisp, while the lemon filling sets into a silky custard. Whether you’re new to keto or a seasoned pro, this recipe is a keeper. It reminds me of the classic lemon bars my grandmother used to make, just without the sugar crash. I like to dust them with a little powdered erythritol right before serving to mimic that snowy powdered sugar look.

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Tips for Making This Recipe:

Make the crust a day ahead. This little trick saves time on the day of, and it guarantees the crust is completely cool before you add the filling. A warm crust can cause the lemon custard to separate, so patience here pays off.
Measure xanthan gum carefully. A little goes a very long way. I use exactly 1 teaspoon for the filling. Even a pinch too much and your bars can turn gummy and unappetizing.

How to Make Keto Lemon Bars

This process is straightforward, but I’ll walk you through every step so you get those clean, neat squares on your first try. Grab an 8×8 inch pan, some parchment paper, and let’s get baking.

Step 1: Prepare the crust

Preheat your oven to 350°F. Melt 6 tablespoons of butter. In a food processor, pulse 1 1/2 cups of macadamia nuts until they resemble fine crumbs. You want them about the size of almond flour. Add the melted butter and 3 tablespoons of Swerve confectioners sweetener. Pulse a few more times until the mixture clumps together when pressed.

Line your 8×8 pan with parchment paper, leaving some overhang for easy lifting later. Press the crust mixture firmly and evenly into the bottom of the pan. Bake for 20 to 25 minutes, or until the edges turn golden. Set aside to cool completely. I like to pop it in the fridge to speed things up.

Step 2: Make the lemon filling

In a medium bowl, whisk together 4 large eggs and 4 egg yolks with 1/2 cup of Swerve confectioners until combined. Set it aside.

In a small saucepan, combine 1/2 cup of fresh lemon juice, 1 tablespoon of lemon zest, 1 teaspoon of xanthan gum, the remaining 1/4 cup of Swerve confectioners, and 1/4 teaspoon of salt. Bring this mixture to a boil over medium heat, whisking constantly, and let it bubble for 1 full minute. The xanthan gum will start to thicken the juice and create a syrupy base.

Step 3: Temper the eggs and cook the custard

Remove the lemon mixture from the heat. Slowly drizzle the hot liquid into the egg mixture while whisking nonstop. This tempers the eggs gently so they don’t scramble. Once combined, pour everything back into the saucepan. Cook over medium-low heat, whisking constantly, for about 5 minutes. You’ll feel the custard thicken noticeably and it should coat the back of a spoon. Off the heat, gradually whisk in 2 tablespoons of butter until it melts and the custard becomes glossy. Let it cool for about 10 minutes.

Step 4: Blend until silky smooth

Pour the slightly cooled filling into your food processor (no need to wash it after the crust). Blend for 2 to 3 minutes until the filling turns pale and fluffy. This step eliminates any lumps and makes the final texture incredibly creamy. If you want an extra boost of lemon flavor, now is the time to add 3 drops of food-grade lemon essential oil or 1 teaspoon of lemon extract.

Step 5: Assemble and chill

Spread the lemon filling evenly over the completely cooled crust. Smooth the top with a spatula. Cover the pan with plastic wrap and refrigerate for at least 4 hours, though overnight is even better. The filling needs this time to set firmly. When you’re ready to serve, use the parchment overhang to lift the entire slab out of the pan. Dust with powdered Swerve confectioners, then slice into 12 neat bars with a sharp knife.

Frequently Asked Questions for Low Carb Lemon Bars

How many carbs are in a keto lemon bar?

Most keto lemon bars have about 2 to 4 net carbs per serving, depending on the sweetener and crust ingredients used. Always check the specific recipe for exact counts.

What is the best sweetener for keto lemon bars?

A blend of erythritol and allulose or monk fruit works best. They provide sweetness without a strong aftertaste and help the filling set properly.

Can I use coconut flour instead of almond flour for the crust?

Yes, but you need to adjust the amount since coconut flour absorbs more liquid. Use about one-quarter of the almond flour amount and add an extra egg or butter to keep the crust from being dry.

How do I store keto lemon bars?

Store them in an airtight container in the refrigerator for up to one week. Keep them separated with parchment paper to prevent sticking.

Can I freeze keto lemon bars?

Yes. First chill them completely, then wrap each bar in plastic wrap and place in a freezer-safe bag. They will keep for up to three months. Thaw in the fridge before serving.

Are keto lemon bars actually good?

Many people find them delicious, especially when made with a buttery almond flour crust and a tangy, creamy lemon filling. They mimic the texture and taste of classic lemon bars without the sugar.

Variations for This Recipe

Switch up the nuts. Pecans work wonderfully in place of macadamia nuts. They add a slightly different nutty depth and are often cheaper too.
Skip the lemon extract. If you prefer a purely fresh citrus flavor, just omit the lemon essential oil or extract. The fresh juice and zest are already punchy enough.
Use your favorite keto sweetener. As long as it’s a powdered, confectioners-style sweetener that measures like sugar, you’re golden. Monk fruit blends work beautifully too.

Other Low Carb Desserts to Try:

If you love these keto lemon bars, I have a few other sugar-free treats that you’ll find irresistible. They’re all simple, satisfying, and perfect for staying on track.

Low Carb Lemon Bars

These keto lemon bars are tart and refreshing, with a rich buttery crust that holds everything together beautifully. You can easily customize them by swapping the macadamia nuts for almonds or even unsweetened shredded coconut. Here’s the complete recipe at a glance.

Ingredient	Crust	Filling
Butter	6 tbsp, melted	2 tbsp, cold
Macadamia nuts	1 1/2 cups, pulsed	–
Swerve confectioners	3 tbsp	3/4 cup, divided
Eggs	–	4 large + 4 egg yolks
Lemon juice	–	1/2 cup fresh
Lemon zest	–	1 tbsp
Xanthan gum	–	1 tsp
Salt	–	1/4 tsp
Lemon oil/extract (optional)	–	3 drops or 1 tsp

Nutrition per bar (12 bars total): 231 calories, 4g total carbs, 2g fiber (2g net), 4g protein, 23g fat. Prep time: 30 minutes. Cook time: 25 minutes. Total: 55 minutes plus chilling.

Other Low Carb Lemon Recipes to Try:

Looking for more sunshiney lemon desserts to brighten your keto journey? I’ve rounded up a few recipes from my trusted blogging friends that you absolutely have to try.

easy keto lemon bars recipe from Wholesome Yum
low carb lemon bars dessert from Low Carb Yum
best keto lemon bars recipe from Ditch the Carbs

Keto Lemon Bars Recipe with Almond Flour Crust

Keto Lemon Bars for the Win!

Tips for Making This Recipe: