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    Home » Cookies » Keto Lemon Bar Cookies

    Published: Apr 3, 2022 · Modified: Apr 2, 2022 by Carolyn

    Keto Lemon Bar Cookies

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

    11.9K shares
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    Tender cookie cups filled with creamy keto lemon curd! These keto lemon bar cookies are a sweet and tangy treat that’s sure to please.

    A white plate full of keto lemon bar cookie cups with lemon curd and flowers in the background.

    Spring is here and lemon desserts are popping up everywhere! Especially here on this keto recipe website, because I can’t help myself. I have so many delicious ideas for lemon treats and not nearly enough time to make them all.

    And I already have such a large archive of sweet lemony recipes, like keto lemon cheesecake bars and lemon sour cream pie. But what’s one more? Or five more? Or 10 more?

    Because as far as I am concerned, there are never enough lemon desserts in the world. It’s a brighter, happier place when that sweet-tart flavor is in abundance.

    So let’s make some keto lemon bar cookies!

    Close up shot of keto lemon bar cookies on a white plate.

    Recipe inspiration

    You know I am always poking around the food blogging world, looking for recipes to ketofy. I enjoy this recipe research so much and I discover so many great ideas.

    This particular idea came from Six Sisters Stuff. I spotted it a few weeks ago and thought it was ripe for a keto makeover. And I knew just how to do it, using the cookie cups from my Keto Boston Cream Pie Bites, as well as my ever-popular keto lemon curd.

    One great tip I borrowed from their recipe was to form the wells in the cookies AFTER they’ve been baking for a bit. This keeps the edges from cracking as you press it into the muffin cups.

    It all tastes the same in the end, but the keto lemon bar cookies look better when they are finished. And appearances matter!

    Keto lemon curd in a white bowl, with lemons and cookie cups in the background.

    Ingredients

    No crazy products needed here! Just basic keto baking ingredients.

    • Almond flour
    • Keto sweetener (granular and powdered)
    • Baking powder
    • Butter,
    • Eggs
    • Vanilla extract
    • Lemon (juice and zest)
    • Salt
    Four photos showing how to make keto lemon bar cookies.

    How to make keto lemon bar cookies

    These adorable lemon treats are essentially keto sugar cookies made into tiny tart shells and then filled with sugar-free lemon curd. Dusted with a little keto sweetener, they taste just like lemon bars!

    The cookie cups

    1. Prepare the pan: I highly recommend a silicone mini muffin pan or some silicone muffin liners for this recipe. Parchment liners work too but the cookie cups brown more quickly.
    2. Make the cookie dough: This is an almond flour recipe, although you could use other nut flours or seed meals. However, the cookies won’t be as fine or as light in color if you switch out the flour.
    3. Roll into balls: Try to get 24 balls, which means making them just barely 1-inch in diameter. Leave them as balls at this point and bake for 5 minutes. Allowing the cookies to bake for a bit softens the dough so that it cracks less as you press it into the pan.
    4. Press wells into the center: Use a blunt, rounded instrument like teaspoon or the end of a wooden spoon, or even your thumb. I use the end of my stone pestle, as it’s the perfect thickness.
    5. Bake until just barely golden: To mimic lemon bars, you want the cookie cups to be quite light in color. Don’t let them get too browned!
    6. Remove and let cool: If the wells in your cookies have puffed up a bit, reshape them when the cookies are still warm.

    The lemon filling

    1. Prepare a half recipe of keto lemon curd: This is a very simple recipe and results in deliciously tangy-sweet curd.
    2. Whisk nearly constantly: The trick to a smooth and creamy curd it stand there, whisking the whole time, so that your eggs don’t curdle.
    3. Spoon into the cookies: Let the curd cool for a few minutes and then spoon it directly into the cookie cups. Chill for at least one hour to help set the filling.
    4. Dust with powdered sweetener: To get that classic lemon bar look, dust the cookies lightly with powdered sweetener before serving.
    A white oval plate filled with keto lemon bar cookie cups.

    Frequently Asked Questions

    I am allergic to almonds, can I use coconut flour?

    No, coconut flour will not work in this recipe. You can try using sunflower seed flour, but be sure to add a tablespoon of lemon juice or vinegar to offset the green reaction.

    Can I use a different sweetener?

    If you want crisp cookies, you must use an eyrthritol-based sweetener in that part of the recipe. Swerve or Lakanto both work very well. For the filling, you want to use a powdered sweetener to avoid any grittiness. I do find that allulose requires more time to set properly in a custard or curd like this.

    Can you make these keto lemon bar cookies in advance?

    Lemon curd is best fresh and should be eaten within 4 days. So if you want to prep these cookies in advance, I recommend making the cookie cups and storing those. Then make the curd on the day you plan to serve them.

    I only have a metal mini muffin pan, what do I do?

    As long as your pan is a really good non-stick, you can still make the cookie cups. Grease it very well. The cups will likely get much darker in colour because they are right against the metal.

    I only have a regular muffin pan, can I make these bigger?

    Certainly! You should be able to get 12 larger cookies in a regular pan. Don’t try to press the cookie crust all the way up the sides of the pan, as it will make them too thin and fragile. About halfway up is right.

    Close up shot of keto lemon bar cookies with a bite taken out of one.

    Storage information

    Lemon curd is a custard-style dessert and is thus best served within a few days. Store the completed lemon bar cookies in the fridge in a covered container for up to 4 days.

    More bite-sized keto desserts!

    • Easy Keto Ice Cream Truffles
    • Keto Cheesecake Bites
    • Strawberry Shortcake Cups
    • Keto Peanut Butter Cups
    • Raspberry Cheesecake Bites
    • Churro Fat Bombs
    • Chocolate Fat Bomb Bites
    Close up shot of keto lemon bar cookies on a white plate.

    Keto Lemon Bar Cookies

    Tender cookie cups filled with creamy keto lemon curd! These keto lemon bar cookies are a sweet and tangy treat that's sure to please. 
    4 from 1 vote
    Print Pin Rate
    Course: Dessert
    Cuisine: American
    Keyword: keto lemon bars, keto lemon cookie cups
    Prep Time: 30 minutes
    Cook Time: 25 minutes
    Chill time: 1 hour
    Total Time: 55 minutes
    Servings: 12 servings
    Calories: 157kcal

    Equipment

    • 1 silicone mini muffin pan

    Ingredients

    Cookie Cups

    • 1 ¾ cup almond flour
    • ½ cup Swerve Granular
    • ½ teaspoon baking powder
    • ¼ teaspoon salt
    • ¼ cup butter melted
    • 1 large egg white
    • ½ teaspoon vanilla extract

    Lemon Curd Filling

    • 1 large egg
    • 1 large egg yolk
    • ⅓ cup powdered Swerve Sweetener
    • 2 tablespoon freshly squeezed lemon juice
    • 2 teaspoon grated lemon zest
    • 2 tablespoon butter cut into four pieces
    • Additional powdered sweetener for garnish
    US Customary – Metric

    Instructions

    Cookie Cups

    • Preheat the oven to 325F and line a mini muffin pan with 24 silicone liners (or use a silicone mini muffin pan).
    • In a large bowl, whisk togehter the almond flour, sweetener, baking powder, and salt. Stir in the melted butter, egg white, and vanilla extract until the dough comes together.
    • Roll the dough into scant 1 inch balls and place in the prepared muffin cups. Bake 5 minutes in ball form, then remove from the oven and use your thumb, a rounded teaspoon, or another blunt rounded instrument to press a deep well into the center of each ball.
    • Bake another 10 to 12 minutes, until just browning lightly on the edges. Remove and let cool completely in the pan. If the wells in your cookies have puffed up a bit, reshape them when the cookies are still warm. Once cool, pop the cookie cups out of the silicone molds.

    Lemon Curd Filling

    • In a glass or ceramic bowl set over a pan of barely simmering water, whisk together the egg, egg yolk, sweetener, lemon juice, and lemon zest. Whisk continuously until the mixture thickens, about 10 minutes. Watch carefully as it will thicken all of a sudden.
    • Immediately remove from heat and add the butter. Let sit a few minutes to melt and then whisk until smooth and creamy. Let cool 15 minutes.
    • Spoon the curd into the cookie cups, filling all the way to the top. Refrigerate at least 1 hour to firm up, then dust lightly with powdered sweetener. Serve cold or room temperature.
    Nutrition Facts
    Keto Lemon Bar Cookies
    Amount Per Serving (2 cookie cups)
    Calories 157 Calories from Fat 129
    % Daily Value*
    Fat 14.3g22%
    Carbohydrates 3.9g1%
    Fiber 1.8g7%
    Protein 4.6g9%
    * Percent Daily Values are based on a 2000 calorie diet.
    11.9K shares

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    Nutritional Disclaimer

    Please note that I am not a medical or nutritional professional. I am simply recounting and sharing my own experiences on this blog. Nothing I express here should be taken as medical advice and you should consult with your doctor before starting any diet or exercise program. I provide nutritional information for my recipes simply as a courtesy to my readers. It is calculated using MacGourmet software and I remove erythritol from the final carb count and net carb count, as it does not affect my own blood glucose levels. I do my best to be as accurate as possible but you should independently calculate nutritional information on your own before relying on them. I expressly disclaim any and all liability of any kind with respect to any act or omission wholly or in part in reliance on anything contained in this website.

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      Recipe Rating




    1. Anj says

      May 12, 2022 at 6:38 pm

      These were great! I am going to aim next time for a less sweet cookie part. If I cut the sweetener in half what do you suggest my adjustment should be? More flour? If so how much? Thanks!

      Reply
      • Carolyn says

        May 12, 2022 at 8:31 pm

        No adjustment needed.

        Reply
    2. Heather says

      April 22, 2022 at 6:45 am

      Can you use line instead of lemon for a key lime pie flavor?

      Reply
      • Carolyn says

        April 22, 2022 at 7:39 am

        That would be delicious!

        Reply
    3. Wendy says

      April 21, 2022 at 7:58 am

      Can these be frozen?

      Reply
    4. Annabelle says

      April 08, 2022 at 1:30 am

      4 stars
      My lemon curd didn’t thicken up. I followed the recipe exactly except I put half teaspoon Lemon extract instead of lemon zest. Do you think this might have something to do with not thickening? I put small pinch of xanthum gum before putting butter in. Its ok but not real thick. Otherwise, the biscuit part is great.

      Reply
      • Carolyn says

        April 08, 2022 at 7:44 am

        I don’t think it’s the lemon extract. Did you use a different sweetener at all? You said “biscuit” for the cookie part so I suspect you are in the UK and have different sweeteners… But it may also simply not have been cooked quite sufficiently.

        Reply
    5. Missy Morrill says

      April 05, 2022 at 4:56 am

      Can I use Lankanto sweetener and powdered sugar instead of Swerve?

      Reply
      • Carolyn says

        April 05, 2022 at 1:12 pm

        Yes, those should work.

        Reply
    6. Joan Springer says

      April 04, 2022 at 9:11 am

      Your lemon curd is fantastic. I have found I can make it in my vitamix without any stirring at all. I add everything but the butter and process on high (which heats the mixture) for about 5 minuets, till thickens. Next reduce speed to half and add the butter in pieces through the plug. I blend once again on high for 10 seconds and it’s perfect!

      Reply
      • Roberta says

        April 04, 2022 at 2:12 pm

        Thanks for sharing this strategy to make this recipe even easier in a hurry!

        Reply
    7. RebeccaJ says

      April 03, 2022 at 7:45 pm

      Can I substitute something for the butter? I can’t have dairy.

      Reply
    8. Eileen says

      April 03, 2022 at 5:25 pm

      Do you have to use the silicone liners or muffin tin? Could you use the paper liners?

      Reply
      • Carolyn says

        April 04, 2022 at 3:54 pm

        Never use paper liners for keto recipes. Parchment yes, regular paper, no. Everything sticks too much.

        Reply
    9. Kate says

      April 03, 2022 at 11:00 am

      Can’t wait to make. Lemon bars are my favorite dessert and I loved your lemon curd tart recipe.

      Reply

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