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Keto Lemon Bars

4.94 from 256 votes
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This recipe may contain Amazon or other affiliate links. As an Amazon Associate I earn from qualifying purchases.

These Keto Lemon Bars are the best keto dessert for summer to fix your sweet tooth with no guilt and only 2.5 grams of net carbs per serving.

A melt-in-your-mouth shortbread crust topped with tangy lemon curd for a refreshing decadent sugar-free dessert.

Keto Lemon Bars

Are Classic Lemon Bars Keto?

No, a classic lemon bar is made with a high-carb wheat-based crust topped with sweet curd made with lots of sugar.

Therefore this is not diabetic-friendly unless you adapt the recipe.

Time to enjoy a lemon ow carb recipe and welcome summer with no guilt!

Keto-Baking-Guide-Best-Bread-Recipes Carine Grab my Keto Meal Plans! Use one of my many keto meal plans to reach your health goals!

Why You’ll Love These Bars

These low-carb keto lemon bars are not only a diabetic-friendly dessert but also naturally:

  • Gluten-Free
  • Paleo-Friendly
  • Grain-Free
  • Vegetarian
  • Dairy-Free Option
  • Low-Carb
  • Keto
Keto Lemon Bars

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How To Make Keto Lemon Bars

It’s very easy to make keto-friendly lemon bars you first need to make a low-carb shortbread biscuit using low-carb flours and keto sweeteners.

Then, you need to prepare a sugar-free lemon curd to spread on top of the shortbread base and bake the entire dessert until set.

Finally refrigerate, slice, and serve.


For the low-carb almond crust, you need:

  • Eggs – Prefer free-range organic eggs for the best taste. Eggs are keto-friendly ingredients.
  • Blanched Almond Flour – use ultra-fine almond flour and avoid almond meal that is coarse and dark in color. It makes gritty shortbread.
  • Low-Carb Granulated Sweetener, like erythritol or allulose.
  • Vanilla Extract
  • Melted Butter or melted coconut oil for a dairy-free option.
  • Pinch of Sea Salt

For the low-carb lemon curd you need:

  • Fresh Lemons– squeezed to get the lemon juice and lemon zest
  • Melted butter or melted coconut oil
  • Eggs
  • Almond Flour

Preparing The Shortbread

Preheat the oven to 350°F (180°C).

First, line an 8-inch x 8-inch square pan with parchment paper.

Make sure there’s some parchment paper overhanging on the sides. It makes it easier to remove the low-carb lemon bar from the pan later.

Spray oil over the pan to prevent the crust from sticking to it.

Next, in a large mixing bowl, combine all the shortbread crust ingredients: almond flour, egg, melted butter, vanilla extract, sweetener, and salt.

The batter should look crumbly but not dry either.

You should be able to stick ingredients together if squeezed in your hand. If not add a little bit more melted butter or coconut oil.

Baking The Shortbread

Press the shortbread biscuit at the bottom of the prepared pan to form an even layer. Use the back of a spoon or silicone spatula to smooth the layer and press it down easily.

Prick the biscuit with a fork to prevent it from puffing in the oven.

Bake in the center rack of the preheated oven at 350°F (180°C) until the crust is golden brown – about 15 minutes.

Keto Lemon Bars

Making Lemon Curd

Meanwhile, prepare the lemon curd. In a mixing bowl, beat eggs with melted butter and lemon juice.

You don’t have to use an electric beater, use a hand whisk and beat until just combined.

Then, stir in almond flour. Set aside at room temperature until the crust is baked.

Remove the pan from the oven and immediately pour the filling on top of the baked crust.

Bake again until the curd is set. Watch it carefully and remove the pan from the oven when it’s set on top but still a bit jiggly in the middle to keep the dessert moist.

Cool completely in the pan for one hour then place the pan for 3 hours in the fridge before slicing.

This technique ensures the slice is firm and easy to slice without breaking apart.

Release the bar from the pan using the hanging part of parchment paper.

Pull out the gluten-free lemon bar from the pan and place the bar on a chopping board and cut it into 16 squares.

Keto Lemon Bars


These keto lemon bars are delicious served with some topping like:

  • Unsweetened Whipped Cream
  • Freshly Grated Lemon Zest
  • Coconut Yogurt
  • Thin Slices of Lemon
  • Dust of Sugar-Free Powdered Sweetener like powdered erythritol or powdered allulose.


These almond flour lemon bars can be stored in an airtight box in the fridge for up to 4 days.

You can also freeze lemon bars, preferably in zip-lock bags or airtight containers to keep the keto lemon bars recipe fresh and moist.

Thaw in the fridge the day before serving.

Allergy Swaps

Below I answered all your questions about how you can adapt the recipe to your food allergies:

  • Dairy-Free – replace the melted butter with melted coconut oil. I recommend using refined coconut oil to avoid adding a coconut flavor to the bars even if lemon coconut is a delicious combination. Note that the filling comes out less yellow using this option.
  • Nut-free – the best swap to almond flour is sunflower seed flour or sesame flour. Both are gluten-free keto flour that can be used as a 1:1 ratio swap to almond flour

You can’t make this recipe egg-free, it wouldn’t work.

Frequently Asked Questions

Can I Replace The Almond Flour With Coconut Flour?

You can’t use coconut flour or it will be a very different ratio since coconut flour contains four times fiber.

Can I Use Packaged Lemon Juice?

You can but the flavor of the dessert won’t be as flavorsome and you will miss some lemon flavor.

You can balance that by adding 1 teaspoon of natural lemon extract to the custard.

Can I Use Almond Meal Instead Of Almond Flour?

You can but the texture won’t be the same. The crust and filling will be slightly grainy and darker in color.

How Many Carbs Are In Keto Lemon Bars?

These Keto Lemon Bars have only 2.5 grams of net carbs per serving.

Keto Lemon Bars Recipe

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Keto Lemon Bars

Keto Lemon Bars

2.5gNet Carbs
These Keto Lemon Bars is a delicious sugar-free lemon dessert with an almond flour crust topped with tangy lemon curd.
Prep: 20 minutes
Cook: 35 minutes
Total: 55 minutes
Yield: 16 bars
Serving Size: 1 square
4.94 from 256 votes


Almond flour crust

Lemon Curd filling


This recipe may contain Amazon or other affiliate links. As an Amazon Associate I earn from qualifying purchases.


  • Preheat the oven to 350°F (180°C). Line a 9-inch square pan with parchment paper. Make sure you keep hanging parts of paper on sides. Slightly grease paper with butter or coconut oil. Set aside.
  • Prepare the shortbread crust. In a mixing bowl, stir almond flour, salt, erythritol, beaten egg, vanilla extract, and melted butter. The mixture should be crumbly but not dry, if pressed together it holds. If not, add an extra tablespoon of melted butter.
  • Pour the crumbly shortbread crust over the prepared pan and press firmly and evenly with a flat tool. Prick the crust with a fork.
  • Pre-bake for 15 minutes until the crust is golden brown and crispy on the edges
  • Meanwhile, prepare the lemon filling.
  • In a mixing bowl, use a hand whisk to beat eggs with lemon juice, melted butter, erythritol, and lemon zest. Beat in almond flour at the end.
  • When the crust is baked, remove the pan from the oven and immediately pour the filling on top.
  • Return the pan to the oven for 15-18 minutes or until the filling is set on the top but still soft and jiggly in the middle. Don't overbake, or the filling will be dry, watch it carefully.
  • Cool down in the pan for 1 hour then cool down in the fridge for 3 hours or overnight before slicing.
  • Serve with powdered erythritol if desired and extra lemon zest for flavor.


  • Store in an airtight cake box in the fridge for up to 3 days or freeze and thaw in the fridge the day before.
Tried this recipe?Mention @sweetashoneyrecipes
Nutrition1 square
Yield: 16 bars


Serving: 1 squareCalories: 152.1 kcal (8%)Carbohydrates: 4.3 g (1%)Fiber: 1.8 g (8%)Net Carbs: 2.5 gProtein: 5.4 g (11%)Fat: 13.6 g (21%)Saturated Fat: 1.9 g (12%)Polyunsaturated Fat: 1.4 gMonounsaturated Fat: 2.7 gTrans Fat: 0.1 gCholesterol: 58.1 mg (19%)Sodium: 108.6 mg (5%)Potassium: 33 mg (1%)Sugar: 0.9 g (1%)Vitamin A: 274.6 IU (5%)Vitamin B12: 0.1 µg (2%)Vitamin C: 3.8 mg (5%)Vitamin D: 0.3 µg (2%)Calcium: 44.8 mg (4%)Iron: 0.9 mg (5%)Magnesium: 2.6 mg (1%)Zinc: 0.2 mg (1%)
Carine Claudepierre

About The Author

Carine Claudepierre

Hi, I'm Carine, the food blogger, author, recipe developer, published author of a cookbook and many ebooks, and founder of Sweet As Honey.

I have an Accredited Certificate in Nutrition and Wellness obtained in 2014 from Well College Global (formerly Cadence Health). I'm passionate about sharing all my easy and tasty recipes that are both delicious and healthy. My expertise in the field comes from my background in chemistry and years of following a keto low-carb diet. But I'm also well versed in vegetarian and vegan cooking since my husband is vegan.

I now eat a more balanced diet where I alternate between keto and a Mediterranean Diet

Cooking and Baking is my true passion. In fact, I only share a small portion of my recipes on Sweet As Honey. Most of them are eaten by my husband and my two kids before I have time to take any pictures!

All my recipes are at least triple tested to make sure they work and I take pride in keeping them as accurate as possible.

Browse all my recipes with my Recipe Index.

I hope that you too find the recipes you love on Sweet As Honey!

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    9 Thoughts On Keto Lemon Bars
  1. I really would like to make this slice for a Christmas party but the measurement for the ingredientshas an A with a funny mark on top of it so I cant work our how much to use.
    For the Lemon Curd I cant work out how much sweetner it just has a little a then cup?
    Can you rectify this issue so I can make this slice please it looks delicious.

  2. 5 stars
    These were delicious! I had to make them with coconut oil instead of butter, and they were still great!


The recipes, instructions, and articles on this website should not be taken or used as medical advice. You must consult with your doctor before starting on a keto or low-carb diet. The nutritional data provided on Sweetashoney is to be used as indicative only.

The nutrition data is calculated using WP Recipe Maker. Net Carbs is calculated by removing the fiber and some sweeteners from the total Carbohydrates. As an example, a recipe with 10 grams of Carbs per 100 grams that contains 3 grams of erythritol and 5 grams of fiber will have a net carbs content of 2 grams. Some sweeteners are excluded because they are not metabolized.

You should always calculate the nutritional data yourself instead of relying on Sweetashoney's data. Sweetashoney and its recipes and articles are not intended to cure, prevent, diagnose, or treat any disease. Sweetashoney cannot be liable for adverse reactions or any other outcome resulting from the use of recipes or advice found on the Website.