Keto Lemon Bars Recipe

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These keto lemon bars have a thick, rich buttery shortbread-like crust and a silky, tangy lemon custard on top. This is the perfect low carb dessert and a serving has less than 2g net carbs.

Keto Lemon Bars Recipe - Try these easy, sugar-free lemon bars that have only 2g net carbs and very tasty! You will never believe they are keto friendly, low calories, low carb and sugar free! | #Glutenfree #Lowcarb #keto #sugarfree #healthy via @lowcarbspark

Without any doubt, I’m a dessert kind of girl. I remember eating all the sweets at family dinners before getting to the main course. This lemon bar recipe is special to me because my grandmother used to make it all the time.

If you are craving something refreshing on a keto diet and think that fruits are not an option, that’s not true. Here’s a complete keto-approved fruits list with all the carb count in most fruits.

Keto Lemon Bars Ingredients

You’ll never want to buy premade keto bars ever again. The taste is on point, the texture is fantastic, and the macros are incredible. So go ahead and bake this lemony goodness, it takes less than 10 minutes to mix all the ingredients.

Keto Shortbread Crust Ingredients

  • 1 1/2 cup almond flour
  • 1/2 cup butter
  • 1/4 cup erythritol, powdered
  • 1 tsp vanilla extract
  • 1/8 tsp salt

Sugar-free Lemon Filling Ingredients

  • 3 medium lemons or about 3/4 cup lemon juice
  • 3 large eggs, at room temperature
  • 3/4 cup almond flour
  • 3/4 cup erythritol, powdered
keto lemon bars recipe

How to Make Perfect Keto Lemon Bars?

  1. To get as much juice as possible from the lemons roll it roughly on the counter, pressing the lemon. This trick will help the lemon to loosen up the juices. You’ll need about 2/3 cup lemon juice.
  2. Using ingredients at room temperature is the key to perfect lemon bars.
  3. Make powdered erythritol at home. If you only have granular erythritol you can quickly turn it into powder by using a coffee grinder or a blender.
  4. Try to spread the crust as even as possible. Use a spatula or the back of a glass to make this step easier.
  5. After baking the keto, crust let it completely cool before adding the filling.
  6. Serve them cold from the refrigerator. I noticed that letting the bars overnight brings out much flavor.
  7. If you want a thinner crust, use only 1 cup almond flour and adjust the butter until your crust dough sticks together. This lemon recipe has a thick crust because that’s how I love it.

Do you like lemon desserts that are quick and low in carbs? You have to try my quick and easy lemon poppy seed keto mug cake recipe.

keto lemon bars easy keto recipe

How Many Carbs are in Keto Lemon Bars?

I cut my lemon bars into 16 squares, and each has only 2g net carbs.

Don’t freak out if you count the macros for this keto recipe and get different results.

To figure out net carbs, you have to subtract sugar alcohols and fiber from the total carbs because they pass through our digestive system without affecting the insulin levels.

keto lemon bars keto dessert

What can I Use Instead of Erythritol?

If you don’t have erythritol in your pantry, you can use another low carb sweetener such as monk fruit sweetener to make amazing sugar-free keto low carb lemon bars. If you are following a paleo diet and carbs are not the main focus, you can use coconut sugar or honey.

How many Carbs are in Lemons?

You probably wonder how many carbs are in one lemon. I drink a glass of warm water with 2 tbsp lemon juice each morning because it has many health benefits including improved digestion.

Let me tell you that lemons, according to USDA website are low in carbs and one medium lemon has:

  • 8g carbohydrates
  • 2.4g fiber
  • 5.6g net carbs
  • 24 calories

Can I use Coconut Flour instead of Almond Flour?

For the filling, you can use 2 tbsp coconut flour instead of almond flour. You’ll get the same results: a delicious smooth custard. To make the crust use 1 cup of coconut flour.

Other Recipes You Might Like

keto lemon bars recipe

Keto Lemon Bars

4.05 from 24 votes

Prep time 10 mins
Cook Time 1 hr
Yelds 16 keto lemon bars


These keto lemon bars have a thick rich buttery crust and a silky tangy lemon custard on top. With only 2g net carbs per serving, you can enjoy a decadent keto dessert.
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For the almond flour crust

For the lemon filling


  • Preheat the oven to 350°F/180°C and line an 8X8 inch baking pan with parchment paper. Set aside. 
  • For the crust: In a food processor, add the almond flour, melted butter, powdered erythritol, vanilla extract and a pinch of salt. Process until a dough forms. You can use a hand mixer.
  • Evenly press the dough into the prepared pan and bake until lightly golden brown, about 15 minutes. Once cooked, let cool for at least 30 minutes.
  • Prepare the filling: Juice all the lemons and add them to a medium bowl.
  • Combine the lemon juice, with room temperature eggs, sweetener, lemon zest and whisk for 30 seconds. Don't use a hand mixer because overmixing the ingredients can cause cracks in your keto lemon bars.
  • Stir in the almond flour and pour the topping over the cooled crust whisking while pouring to ensure that all the ingredients are evenly distributed.
  • Bake for about 25 minutes or until the filling looks set.
  • Let it cool, then refrigerate for at least 2 hours before slicing. Use a sharp knife to cut them into squares. Enjoy!
Nutrition Facts
Amount per serving.
Total Carbs
Net Carbs

How do we calculate the nutrition info?

These nutrition facts listed are determined using nutrition information from the USDA Food Database. Our nutrition facts are accurate, but if you are using different products, please make your calculations. Net carb count is calculated by subtracting both fiber and sugar alcohols because they don’t raise blood sugar.

Course Keto Dessert
Cuisine American
Keyword keto lemon bar
Tried this recipe?Mention @LowCarbSpark or tag #LowCarbSpark!
Keto Lemon Bars Recipe


The full recipe is in the recipe card below. Readers that love this aslo made these recipes:


Ioana is a food and travel lover. Her greatest passion is developing mouthwatering recipes that are comforting, easy to make, and budget friendly! She firmly believes that cooking should be fun! About me...

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Recipe Rating

  1. Your ingredients list says 3 room temp eggs. Your instructions say to add 2 eggs. What’s correct (although it’s too late for me because I already added three)?

  2. I love lemon bars but since starting to follow the Keto diet I gave them up. I made this recipe and OMG they are fantastic and Keto friendly. The crust is a little too thick for me but I can adjust that in the future.

About me

Hello! My name is Ioana Borcea, and I'm here to provide you with mouthwatering recipes. This blog is all about sharing my favorite tested easy to make, delicious low-carb & keto, nutrient-dense recipes.

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