I can never resist these tender keto cookie cups with their creamy, tangy lemon curd centers. They’re bright, sweet, and just fancy enough to make everyone ask for the recipe.
I’m obsessed with these Keto Lemon Bar Cookies because they hit that sharp-sweet lemon bar craving without turning into a whole pan situation. I get tender little cookie cups from blanched almond flour, then that creamy fresh lemon juice filling brings the bite I want.
Bright, tangy, rich. I love how each one feels like a tiny dessert with a serious citrus punch, not some sad low-carb compromise.
And I’ll take that buttery cookie edge with silky lemon curd every single time. But the best part?
I can grab one after dinner and feel like I got the good stuff.
Ingredients
- Almond flour keeps these cookies tender, nutty, and totally keto-friendly.
- Powdered erythritol sweetens things up without the sugar crash later.
- Softened butter gives the cookie base that rich, shortbread-style bite.
- Egg helps hold the dough together, so it doesn’t crumble everywhere.
- Vanilla adds cozy bakery flavor, even though lemon’s the star here.
- Baking powder gives a little lift, so the cookies aren’t too dense.
- Salt makes the sweet and lemony parts pop.
Don’t skip it.
- Egg yolks make the lemon curd thick, silky, and kind of fancy.
- Fresh lemon juice brings the bright tang you’ll actually taste.
- Lemon zest adds extra zing, like sunshine in cookie form.
- Cold butter makes the curd glossy, smooth, and richer.
- Plus, xanthan gum helps firm the curd if you like cleaner bites.
- Basically, it’s sweet, tart, buttery, and low-carb without feeling boring.
Ingredient Quantities
- 2 cups blanched almond flour, packed
- 1/3 cup powdered erythritol or other granulated keto sweetener, divided
- 6 tablespoons unsalted butter, softened, divided
- 1 large egg
- 1 teaspoon pure vanilla extract
- 1/2 teaspoon baking powder
- 1/4 teaspoon fine salt
- 3 large egg yolks
- 1 large whole egg
- 1/2 cup fresh lemon juice (about 2 to 3 lemons)
- 1 tablespoon lemon zest, finely grated
- 4 tablespoons unsalted butter, cold and cut into cubes
- Pinch of salt for the lemon curd
- Optional: 1/8 teaspoon xanthan gum for firmer curd
How to Make this
1. Preheat oven to 350 degrees F and lightly grease a 12 cup muffin tin or line with paper liners.
2. In a bowl combine 2 cups blanched almond flour, 1/4 cup powdered erythritol, 1 teaspoon baking powder, and 1/4 teaspoon fine salt.
3. Add 6 tablespoons softened unsalted butter, 1 large egg, and 1 teaspoon pure vanilla extract to the dry ingredients and mix until a soft dough forms.
4. Divide the dough into 12 equal portions and press each portion into the prepared muffin cups to form a cup with a slight well in the center.
5. Bake for 10 to 12 minutes or until edges are lightly golden. Remove from oven and let cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.
6. Meanwhile make the lemon curd: whisk together 3 large egg yolks, 1 large whole egg, the remaining powdered erythritol, 1/2 cup fresh lemon juice, and 1 tablespoon finely grated lemon zest in a heatproof bowl.
7. Place the bowl over a saucepan of gently simmering water and cook, stirring constantly, until the mixture thickens and coats the back of a spoon about 8 to 10 minutes. If using xanthan gum for a firmer curd, sprinkle a small pinch in while whisking.
8. Remove from heat and immediately whisk in 4 tablespoons cold unsalted butter, cubed, and a pinch of salt until smooth and glossy. Strain the curd through a fine mesh sieve into a clean bowl to remove any cooked egg bits.
9. Allow the curd to cool slightly, then spoon or pipe a generous tablespoon or two into each cooled cookie cup.
10. Chill the filled cookies until the curd is set, at least 1 hour, then serve. Store leftovers refrigerated for up to 5 days.
Equipment Needed
1. 12 cup muffin tin or silicone muffin pan
2. Paper liners (optional) or a pastry brush for greasing
3. Mixing bowls (one large, one heatproof for curd)
4. Electric mixer or wooden spoon and sturdy spatula
5. Measuring cups and spoons
6. Whisk and rubber spatula
7. Saucepan for a double boiler and a heatproof bowl to fit over it
8. Fine mesh sieve and wire cooling rack
FAQ
Keto Lemon Bar Cookies Recipe Substitutions and Variations
- Blanched almond flour: use 1 cup coconut flour plus 1/2 cup additional eggs or 2 extra egg yolks to offset high absorbency; or use 1:1 sunflower seed flour (may brown faster and can turn green with baking soda or acidic ingredients); or use finely ground pecan or walnut meal for similar texture but more pronounced nut flavor.
- Powdered erythritol: swap with powdered monk fruit blend 1:1 for comparable sweetness and no cooling effect; or use allulose 1:1 for a softer, chewier curd and less cooling; or use Swerve Confectioners 1:1 which behaves like powdered sugar in texture.
- Unsalted butter: replace with equal amount coconut oil solidified in the fridge for dairy free option (flavor note coconut); or use ghee 1:1 for a nutty, lactose free butter flavor; or use vegan butter stick 1:1 for dairy free, keeping chilling steps the same.
- Xanthan gum (optional): substitute with 1/2 teaspoon guar gum for similar thickening; or omit and reduce lemon juice by 1 to 2 tablespoons plus chill longer to help set; or use 1 teaspoon powdered gelatin bloomed in 1 tablespoon cold water for a firmer, slightly different set (not vegan).
Pro Tips
1) Measure the almond flour by spooning it into the cup and leveling it off rather than scooping. Packed almond flour can make the dough too dense, so if it feels heavy, gently fluff it before measuring.
2) Keep your butter at true room temperature for the dough. If it is too warm the cups will spread in the oven, and if too cold the dough will be crumbly and hard to press into the tin.
3) Press the dough into the cups gently and evenly, making a clear shallow well for the curd. Overworking or pressing too hard will make the shell tight and more likely to crack when cooled.
4) Cook the lemon curd slowly over barely simmering water and stir constantly. Patience here gives you a silky curd and greatly reduces the chance of scrambled egg bits. Strain the finished curd for the smoothest texture.
5) Chill the filled cups thoroughly before serving so the curd firms up nicely. If you want a firmer set, use a very small pinch of xanthan gum while whisking, but add it sparingly to avoid a gummy mouthfeel. Store leftovers in the refrigerator and bring to room temperature for a few minutes before serving for best flavor.
Keto Lemon Bar Cookies Recipe
I can never resist these tender keto cookie cups with their creamy, tangy lemon curd centers. They’re bright, sweet, and just fancy enough to make everyone ask for the recipe.
8
servings
308
kcal
Equipment: 1. 12 cup muffin tin or silicone muffin pan
2. Paper liners (optional) or a pastry brush for greasing
3. Mixing bowls (one large, one heatproof for curd)
4. Electric mixer or wooden spoon and sturdy spatula
5. Measuring cups and spoons
6. Whisk and rubber spatula
7. Saucepan for a double boiler and a heatproof bowl to fit over it
8. Fine mesh sieve and wire cooling rack
Ingredients
2 cups blanched almond flour, packed
1/3 cup powdered erythritol or other granulated keto sweetener, divided
6 tablespoons unsalted butter, softened, divided
1 large egg
1 teaspoon pure vanilla extract
1/2 teaspoon baking powder
1/4 teaspoon fine salt
3 large egg yolks
1 large whole egg
1/2 cup fresh lemon juice (about 2 to 3 lemons)
1 tablespoon lemon zest, finely grated
4 tablespoons unsalted butter, cold and cut into cubes
Pinch of salt for the lemon curd
Optional: 1/8 teaspoon xanthan gum for firmer curd
Directions
- Preheat oven to 350 degrees F and lightly grease a 12 cup muffin tin or line with paper liners.
- In a bowl combine 2 cups blanched almond flour, 1/4 cup powdered erythritol, 1 teaspoon baking powder, and 1/4 teaspoon fine salt.
- Add 6 tablespoons softened unsalted butter, 1 large egg, and 1 teaspoon pure vanilla extract to the dry ingredients and mix until a soft dough forms.
- Divide the dough into 12 equal portions and press each portion into the prepared muffin cups to form a cup with a slight well in the center.
- Bake for 10 to 12 minutes or until edges are lightly golden. Remove from oven and let cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.
- Meanwhile make the lemon curd: whisk together 3 large egg yolks, 1 large whole egg, the remaining powdered erythritol, 1/2 cup fresh lemon juice, and 1 tablespoon finely grated lemon zest in a heatproof bowl.
- Place the bowl over a saucepan of gently simmering water and cook, stirring constantly, until the mixture thickens and coats the back of a spoon about 8 to 10 minutes. If using xanthan gum for a firmer curd, sprinkle a small pinch in while whisking.
- Remove from heat and immediately whisk in 4 tablespoons cold unsalted butter, cubed, and a pinch of salt until smooth and glossy. Strain the curd through a fine mesh sieve into a clean bowl to remove any cooked egg bits.
- Allow the curd to cool slightly, then spoon or pipe a generous tablespoon or two into each cooled cookie cup.
- Chill the filled cookies until the curd is set, at least 1 hour, then serve. Store leftovers refrigerated for up to 5 days.
Notes
- Below you’ll find my best estimate of this recipe’s nutrition facts. Treat the numbers as a guide rather than a rule—great food should nourish both body and spirit. Figures are approximate, and the website owner assumes no liability for any inaccuracies in this recipe.
Nutrition Facts
- Serving Size: 120g
- Total number of serves: 8
- Calories: 308kcal
- Fat: 32.5g
- Saturated Fat: 10.9g
- Trans Fat: 0.11g
- Polyunsaturated: 3.59g
- Monounsaturated: 11.54g
- Cholesterol: 154mg
- Sodium: 133mg
- Potassium: 212mg
- Carbohydrates: 14.55g
- Fiber: 2.5g
- Sugar: 1.48g
- Protein: 7.55g
- Vitamin A: 480IU
- Vitamin C: 7.5mg
- Calcium: 72.5mg
- Iron: 1.16mg
