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These low carb keto lemon bars are a must-have spring dessert! With a creamy, sweet, and tart lemon filling and buttery shortbread crust, nobody will believe these are sugar-free lemon bars, either. Similar to magic cookie bars and peanut butter bars, the layers of flavor take every bite over the top!

For authentic crust and a super smooth filling, I turned to Besti Monk Fruit Allulose Blend (crystallized and powdered) for this recipe. Since it measures just like sugar but contains 0g net carbs, it’s easy to make a recipe like lemon bars keto friendly! It’s especially crucial for the filling, because unlike other sugar substitutes, Besti dissolves completely and doesn’t crystallize, which means a super smooth filling with no gritty texture.

I also use Wholesome Yum Almond Flour for the mouthwatering shortbread crust without the carb spike from refined flours.

Keto lemon bars with almond flour and Besti.

Why You’ll Love This Keto Lemon Bars Recipe

  • Tangy, sweet flavor
  • Buttery crust with luscious lemon filling
  • Easy prep with simple filling and crust ingredients
  • 3g net carbs per bar
  • Naturally dairy free, gluten-free, and sugar-free
  • The perfect keto dessert for lemon lovers!
Low carb lemon bars freshly sliced.

Ingredients You’ll Need

This section explains how to choose the best ingredients for sugar-free lemon bars, what each one does in the recipe, and substitution options. For measurements, see the recipe card below.

For The Shortbread Crust:

  • Wholesome Yum Almond Flour – With a super fine grind, this makes a buttery crust indistinguishable from a white flour version. You may be able to substitute coconut flour, but I haven’t tested it and you would need to add additional oil or eggs, since coconut flour is more drying. If you want to do this, it might help to use my coconut flour pie crust recipe as a starting point.
  • Besti Monk Fruit Allulose Blend – Other keto sweeteners should also work okay in the crust, but using this crystallized monk fruit sweetener keeps it from getting too dense or dry, since Besti locks in moisture. If you want to cut down on the number of different sweeteners you need, Besti Powdered should work fine in the crust as well.
  • Sea Salt – Balances the sweetness.
  • Coconut Oil – Measured solid, then gently melted. Melted butter will also work.
  • Egg – Use a whole, large egg. A flax egg might work as a substitute, but I haven’t tried it.
  • Vanilla Extract – Use the best quality extract you can (this one is awesome!).

For The Lemon Filling:

  • Besti Powdered Monk Fruit Allulose Blend – The sweetened used here is super important. Using anything granulated will yield a grainy result, anything liquid will prevent the filling from setting, and many brands of powdered sugar substitute will crystallize after cooling, resulting in a gritty texture as well. Powdered Besti is the only one I recommend here, though powdered allulose would also work — you’d need to use 33% more.
  • Wholesome Yum Almond Flour – Helps thicken the filling.
  • Eggs
  • Lemon Juice – Fresh lemon juice makes a big difference here! Bottled juice will still work, but is less flavorful.
  • Lemon Zest – Enhances the tart, lemony flavor. Don’t skip it!
Keto lemon bars ingredients.

How To Make Keto Lemon Bars

This section shows how to make lemon keto bars, with step-by-step photos and details about the technique. For full instructions, see the recipe card below.

  1. Make filling. In a large mixing bowl, stir together almond flour and Powdered Besti for filling. Whisk in eggs, lemon juice, and zest. Set aside.
  2. Make crust. Combine almond flour, Besti, and salt together in a large bowl. Stir in oil, egg, and vanilla.
Filling for sugar-free lemon bars with whisk in a glass bowl.

Almond flour shortbread crust ingredients in a bowl.

  1. Press. Press the shortbread dough into a square baking dish.
  2. Bake. Place crust in the oven until firm and golden.
  3. Add filling. After removing crust from the oven, immediately pour prepared filling over the top.
Almond flour crust pressed into a pan.

Unbaked keto lemon bars in pan.

  1. Bake again. Bake until filling appears set, but is still soft.
  2. Chill. Cool the keto-friendly lemon bars completely on the counter, without moving or cutting. Then, cover with plastic wrap and refrigerate for at least 2 hours to set completely before slicing.
Finished sliced low carb lemon bars.
Tips For The Best Keto Lemon Bars

Tips For The Best Keto Lemon Bars

u003c!u002du002d wp:paragraph u002du002du003ernrnHere’s how to ensure that these keto lemon bars with almond flour turn out perfectly every time:rnrnu003c!u002du002d /wp:paragraph u002du002du003e u003c!u002du002d wp:list u002du002du003ernu003culu003ern tu003cliu003eu003cstrongu003ePrep the filling first.u003c/strongu003e Adding the filling to the crust right away u002du002d and immediately baking u002du002d helps the lemon filling set a bit on the hot crust, so that it doesn’t seep below the crust.u003c/liu003ern tu003cliu003eu003cstrongu003eDon’t poke holes in the crust.u003c/strongu003e This will cause the filling to run underneath it. While my u003ca role=u0022linku0022 href=u0022https://www.wholesomeyum.com/recipes/almond-flour-pie-crust-recipe-paleo-low-carb-gluten-free/u0022u003ealmond flour pie crustu003c/au003e (with similar ingredients) calls for poking holes to prevent bubbling, do NOT do that with sugar-free lemon bars.u003c/liu003ern tu003cliu003eu003cstrongu003eUse parchment paper.u003c/strongu003e Another important way to prevent the filling from leaking out is to have parchment paper over all four sides of the pan.u003c/liu003ern tu003cliu003eu003cstrongu003eBars may crack after cooling.u003c/strongu003e Mine didn’t crack, but sometimes they can. After you cut the bars, the cracks aren’t that noticeable, but if you really want to avoid it, you can bake them in a water bath and watch them closely.u003c/liu003ernu003c/ulu003e

Storage Instructions

Be sure to make this low carb lemon bars recipe ahead of time, as they need time to properly set up before you cut into them. I usually make them the day or night before I serve them, so they have time to set. Store in the refrigerator for up to 3-4 days (if they last that long!).

Can You Freeze Lemon Bars?

Yes, you can freeze lemon bars. Cut them into squares and place on a baking sheet. Freeze until solid, usually a few hours. Then, wrap them in plastic wrap and store in a freezer bag or container.

Thawing Instructions:

Thaw frozen lemon bars in the fridge overnight before serving.

Stack of keto lemon bars.

More Keto Lemon Dessert Recipes

Love keto desserts with a lemony twist? Try these next:

Reader Favorite Recipes

The recipe card is below! Readers that made this also viewed these recipes:

Keto Lemon Bars

With an almond shortbread crust and tangy sweet lemon curd filling, this low carb keto lemon bars recipe is perfect for spring. Just 7 ingredients needed for easy sugar-free lemon bars!

Prep: 10 minutes

Cook: 28 minutes

Chilling Time 2 hours

Total: 38 minutes

Servings: 16 (adjust to scale recipe)

Ingredients

Tap underlined ingredients to see where to get them. Please turn Safari reader mode OFF to view ingredients.

Shortbread crust:

Lemon filling:

Keto Sweeteners

Instructions

Tap on the times in the instructions below to start a kitchen timer while you cook.

  1. Preheat the oven to 350 degrees F (177 degrees C). Line 9×9 inch (23×23 cm) pan with parchment paper, hanging over the sides.

  2. Make the filling first, because it must be ready to go immediately when the crust comes out of the oven. In a medium bowl, stir together almond flour and powdered sweetener.

  3. Whisk in the eggs, lemon juice, and lemon zest, until smooth. Set aside.

  4. To make the crust, combine the almond flour, sweetener and sea salt in a large bowl.

  5. Stir in the melted coconut oil, then the egg and vanilla. The dough will be crumbly, but able to be pressed together.

  6. Press the dough into the lined pan. Bake for about 13 to 16 minutes, until firm and golden.

  7. Remove the crust from oven, and immediately pour the filling over the crust.

  8. Return to the oven for 15 to 18 minutes, until filling is set, but still soft.

  9. Cool completely on the counter, without moving or cutting. Cover and refrigerate for at least 2 hours before slicing.

Recipe Notes

Serving size: 1 bar, or 1/16 of entire recipe

Nutrition Facts

Amount per serving. Serving size in recipe notes above.

Calories 166

Fat 14g

Protein 6g

Total Carbs 5g

Net Carbs 3g

Fiber 2g

Sugar 1g

Nutrition facts are provided as a courtesy. Have questions about calculations or why you got a different result? Please see our nutrition policy.

© Copyright Maya Krampf for Wholesome Yum. Please DO NOT SCREENSHOT OR COPY/PASTE recipes to social media or websites. We’d LOVE for you to share a link with photo instead. 🙂

Keto lemon bars recipe pin.