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5.0 from 87 votes

Keto Lemon Bars

Make easy Keto lemon bars with only 7 ingredients! Ready in 40 minutes. Check out the post for lots of topping ideas, from sugar free lemon drizzle to low carb lemon curd frosting.   

Prep Time
5 mins
Cook Time
5 mins
Total Time
40 mins
Servings: 8
Calories: 321 kcal
Course: Dessert
Cuisine: British

Ingredients

  • 4 eggs large, room temperature
  • ½ cup / 120g sour cream room temperature
  • ½ cup / 120g butter must be very soft
  • ¼ cup / 4 tbsp lemon juice I used 1 ½ lemons
  • zest of 1 lemon
  • 2 cup / 200g almond flour Use 2 tablespoons less for super-fine almond flour
  • 2 teaspoon baking powder
  • ⅓ cup / 40g powdered erythritol or more, to taste.

Instructions

    Cup of Yum
  1. Preheat the oven to 175 Celsius / 350 Fahrenheit. 
  2. Beat the eggs until frothy. Add the sour cream and softened butter and blend with a food processor or electric mixer until combined.
  3. Add lemon juice, the grated zest of 1 lemon and ⅓ cup powdered erythritol or powdered sugar substitute of your choice. Blend. 
  4. Lastly, add the almond flour and baking powder and mix until you have a smooth batter. Adjust sweetener to taste, adding more if required. 
  5. Line a 9x6 inch pan with parchment paper and fill in the batter. 
  6. Bake in the middles shelf of the oven for 35-40 minutes until the top is lightly browned and a skewer inserted comes out clean. 
  7. Leave to cool completely before cutting or removing from the pan. Almond flour cakes are fragile when hot, but they firm up as they cool down. 

Notes

  • 5g net carbs per bar. Makes 8 bars. 
  • For me, 1 ½ lemons yielded ¼ cup lemon juice. For extra zing, you could increase the amount of lemon juice by up to 2 additional tablespoons.
  • Wait until the cake is COMPLETELY cooled before dusting with powdered sweetener. If it's still warm, the erythritol melts into an unsightly sludge. 
  • Please see the post for topping ideas, from sugar-free lemon drizzle to lemon curd frosting. 
  • Store in the fridge for up to 5 days or freeze pre-sliced for up to 3 months. 

Nutrition Information

Calories 321kcal (16%) Total Carbohydrates 6.1g Protein 9g (18%) Fat 30.5g (47%) Saturated Fat 10.8g (54%) Fiber 2.6g (10%) Sugar 1.9g (4%)

Nutrition Facts

Serving: 8Serving

Amount Per Serving

Calories 321

% Daily Value*

Calories 321kcal 16%
Total Carbohydrates 6.1g 2%
Protein 9g 18%
Fat 30.5g 47%
Saturated Fat 10.8g 54%
Fiber 2.6g 10%
Sugar 1.9g 4%

* Percent Daily Values are based on a 2,000 calorie diet.