Keto Lemon Blueberry Cake – Low Carb Cake

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This keto blueberry cake is super moist and topped with a luscious lemon cream cheese frosting. It’s not only a great-looking low carb lemon cake but tastes refreshing, and it’s super easy to make. It’s a personal favorite, and it’s loved by everyone.

best keto lemon blueberry cake recipe

I know that chocolate is the king of desserts (and I shared plenty of keto chocolate desserts). But, this keto lemon blueberry cake is truly the best.

I’m sure you’ll love this keto cake recipe as much as you enjoyed my keto blueberry bread recipe that’s one of the most popular recipes on the blog along with my keto brownies recipe.

Just imagine three beautiful layers of grain-free lemon cake loaded with juicy blueberries filled with a delicious lemon cream cheese frosting made from scratch. And all of that is made without sugar or grains.

This keto lemon blueberry cake with whipped lemon frosting is now on the top of my keto dessert favorites list. And the best part is that it’s so easy to make.

Just stop and take a moment to make this lemon blueberry cake. If you love blueberries or have a birthday coming up, this cake is super moist, and it’s both sweet and tangy.

I love baking and making keto cake is actually super easy. If you love cake, make sure to try my Keto German Chocolate Cake, Keto Carrot Cake, or Keto Flourless Cake.

keto cake with lemon frosting

Watch our quick video to see exactly how to make this keto blueberry cake.

YouTube video

Ingredients For Keto Blueberry Cake

You’ll be impressed by how few simple ingredients are needed for such a delicious cake:

For The Cake Batter:

  • Almond & Coconut Flour   Sift your flour to ensure that the batter doesn’t have any clumps. This way, the texture of the cake is lighter.
  • Baking Powder – makes the keto leaf cakes super fluffy.
  • Eggs – To minimize the eggy flavor, use room-temperature eggs. They are also a good source of protein and help all the ingredients bind together.
  • Lemon Juice – You may juice the same lemon you used for the zest, or you can use store-bought lemon juice.
  • Lemon Zest – adds a boost of lemon flavor, but you can use lemon extract instead.
  • Butter – Because this is a low carb dessert, use unsalted butter and only a pinch of salt. Salted butter will overshadow the sweet flavor. If you want a dairy-free keto cake, use melted coconut oil or avocado oil instead.
  • Vanilla Extract – Use the highest vanilla extract you can find.
  • Sweetener – I used Erythritol in this recipe, but Monk Fruit sweetener or Allulose would also work.
  • Blueberries – For this cake, I used fresh blueberries. You may use frozen blueberries, but be sure to coat them in coconut flour so the extra liquid does not make the cake mushy.
  • Salt – Brings out the sweetness. 

For The Lemon Cream Cheese Frosting

ingredients for the lemon cake sugar free frosting
  • Cream Cheese – Full-fat softened cream cheese is required. If you try to use fat-free, the result will not be as creamy.
  • Heavy Whipping Cream – makes the filling taste super creamy and smooth. You can replace it with coconut cream if you want to make a paleo cake.
  • Lemon Zest –  Nothing beats lemon zest! It’s zesty and adds the perfect taste of lemon.
  • Lemon Juice
  • Butter – softened unsalted butter,
  • Sweetener – I recommend using a powdered sweetener for the frosting as it dissolves easier.
favorite keto blueberry cake slice

How To Make Keto Blueberry Lemon Cake

This Keto Blueberry Lemon Cake is incredibly simple to make in just a few simple steps. Although it appears to be a lot of effort, guess what? It is not that difficult. First, you’ll have to make a keto vanilla cake from scratch and then prepare the best sugar-free lemon cream cheese frosting

Before making the cake batter, make sure that you preheat your oven and prepare your cake pans. You can use a cooking spray or a baking sheet; both ideas are good.

how to make keto blueberry lemon cake

Making the keto cake batter

In a large bowl, combine all the dry ingredients, and set aside.

Add the melted butter, eggs, lemon juice, vanilla extract, and the lemon zest in a separate mixing bowl, and mix them until they are well combined.

Combine the wet ingredients with the dry ones until the batter looks smooth. Allow resting for a couple of minutes.

Fold the blueberries into the cake batter.

Then pour the cake mixture evenly into three prepared round cake pans and bake according to the recipe card below, or until a toothpick or cake tester comes out clean.

Making the Lemon Cream Cheese Frosting

Add all the ingredients to a mixing bowl and beat them until well combined.

Assemble the Keto Lemon Blueberry Cake

layers of keto blueberry cake

To see exactly how to assemble this cake, head to our youtube channel and watch our quick step-by-step video tutorial. 

Alternative Sweetening Options For Keto Cake

  • Erythritol: Erythritol is a sugar alcohol that is found naturally in fruits and vegetables. It has zero calories and doesn’t raise blood sugar levels. It has a similar taste and texture to sugar and can be used in keto baking because it doesn’t affect blood sugar.
  • Monk fruit sweetener: Monk fruit sweetener is extracted from the monk fruit, which is a plant native to Southeast Asia. It has zero calories and is 100-250 times sweeter than table sugar. It can be used in place of sugar in baking and has a similar taste and texture.
  • Allulose: Allulose is a rare sugar that is found naturally in small quantities in some fruits. It has only 0.4 calories per gram and doesn’t raise blood sugar levels. It has a similar taste and texture to sugar and can be used in baking.
  • Tagatose: Tagatose is a low-calorie sweetener that is derived from lactose, which is a type of sugar found in milk.

Are Blueberries Keto?

Berries, such as blueberries, strawberries, and raspberries, have the lowest sugar content compared to any fruit. As a result, berries are ideal for a ketogenic diet. In addition, they are pretty simple to incorporate into your daily macros.

How To Decorate a Keto Cake 

The cream cheese frosting with lemon is incredibly delicious, but it will be slightly softer than regular frosting. If it looks too unstable, pop it in the fridge for a couple of minutes to set up. Because we have three cake layers, divide the frosting into 3 equal portions so there will be enough to cover each cake layer. 

decorate keto lemon blueberry cake with lemon cream cheese frosting

To decorate, I used fresh blueberries and lemon zest- it makes the cake look super clean and fancy. If you’re filling fancy, you can add lemon slices, edible flowers or make a blueberry jam to drip all over the sides. 

Tips for Making The Best Keto Blueberry Lemon Cake

  • To prevent the blueberries from sinking to the bottom of your cake layers, toss them in a tablespoon of coconut flour before adding them to the cake mixture. This will help them to stick in your cake batter and not sink.
  • Sift the dry ingredients, get rid of the bigger clumps, and end up with an airy flour mixture. 
  • Room temperature ingredients are key for baking the best keto cake.
  • Wash your lemons before zesting. Before eating any fruits or veggies, I usually wash them in a water and vinegar bath.
  • Make sure not to over-mix the batter. As a result, the cake may become tough and thick. 
  • Don’t overbake the cake layers.
keto low carb blueberry lemon cake

How To Store Almond Flour Blueberry Cake

Because of the cream cheese frosting, I recommend keeping any leftovers in a cake container in the fridge.

keto lemon cake with cream cheese frosting

Can I Freeze This Keto Blueberry Lemon Cake

Yes, you can, but I suggest eating it fresh.

  • If you want to freeze your cakes without filling, wrap them tightly in plastic wrap and aluminum foil and store them in the freezer.
  • If you’re freezing the cake with the filling, store it in the freezer for 2 hours. When the frosting is frozen enough that nothing sticks to it, wrap the cake in plastic wrap and aluminum foil and set it back in the freezer.

Looking for More Keto Cake Recipes? Try these:

best keto lemon blueberry cake recipe

Keto Lemon Blueberry Cake – Low Carb Cake

4.93 from 13 votes

Prep time 20 minutes
Cook Time 40 minutes
Yelds 16 servings
Author Ioana Borcea from LowCarbSpark.com


This Keto Lemon Blueberry Cake is lemon-infused with a luscious lemon cream cheese frosting. It's not only a great-looking low carb lemon cake but tastes refreshing, and it's super easy to make. It's a personal favorite, and it's loved by everyone.
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Keto Cake Batter:

  • 2 cups almond flour blanched, super-fine
  • ½ cup coconut flour
  • ¼ cup protein powder or more coconut flour
  • 6 large eggs room temperature
  • cup lemon juice juice from 2 medium lemons
  • 2 tbsp lemon zest
  • cup butter melted
  • 1 tsp pure vanilla extract
  • ¾ cup sweetener granulated Erythritol or Monk Fruit
  • 1 cup blueberries
  • 1 tsp baking powder
  • ½ tsp fine sea salt

Lemon Cream Cheese Frosting

  • 12 oz. cream cheese room temperature
  • 6 oz. unsalted butter room temperature
  • 1 cup powdered sweetener
  • 1 tsp vanilla extract
  • 4 tbsp heavy whipping cream
  • 2 tbsp freshly grated lemon zest
  • ¼ cup lemon juice freshly squeezed


  • Preheat the oven to 350°F/180°C. Grease 3 9-inch or 8-inch round cake pans and line the bottom with parchment paper.
  • Make the cake batter: In a medium bowl, combine the almond flour, coconut flour, protein powder, sweetener, baking powder, and salt.
  • In a large bowl, add the eggs, vanilla extract, melted butter, lemon zest, lemon juice. Mix using an electric mixer for about 2 minutes or until frothy.
  • Add the flour mix over the wet ingredients and continue mixing until the batter looks smooth. Fold in the blueberries.
  • Evenly divide the batter between prepared cake pans. Bake for about 30-35minutes until the top is set to touch and the edges look golden brown.
  • Remove from the oven and let cool completely in the pan.
  • Make the frosting: In a large bowl, add all the lemon frosting ingredients and beat using an electric mixer until well combined and there are no lumps visible.
  • Assemble the cake: Place the first cake layer on a cake stand or serving platter. Evenly spread 1/3 of the cream cheese frosting.
  • Place the second cake layer and top with 1/3 of the frosting, then add the last cake layer. Top with the remaining frosting. Decorate with fresh blueberries and lemon zest. Refrigerate for at least 2 hours before cutting.


Nutrition Facts
Amount per serving.
Total Carbs
Net Carbs

How do we calculate the nutrition info?

These nutrition facts listed are determined using nutrition information from the USDA Food Database. Our nutrition facts are accurate, but if you are using different products, please make your calculations. Net carb count is calculated by subtracting both fiber and sugar alcohols because they don’t raise blood sugar.

Course Dessert
Cuisine American
Keyword keto blueberry cake, keto lemon cake
Tried this recipe?Mention @LowCarbSpark or tag #LowCarbSpark!


Ioana is a food and travel lover. Her greatest passion is developing mouthwatering recipes that are comforting, easy to make, and budget friendly! She firmly believes that cooking should be fun! About me...

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Recipe Rating

  1. Is this cake diabetic friendly? Want to make a cake for my mil on her birthday that she doesn’t have to be careful to eat, since she’s diabetic.

    1. Sure, this is a diabetic-friendly cake recipe since it’s made with low-carb sweeteners, almond flour, coconut flour, and other low-carb ingredients.

    1. The batter should be slightly thick but pourable (check the video for visual info). Have you used room temperature ingredients? If not that might be the reason your batter is too thick. You can also add a splash of unsweetened almond milk to thin it out a little.

      1. 5 stars
        I made the cake for a BBQ today. Same here the batter was thick. The finished product was good thou. Next time I’ll try using the ingredients at room temperature before adding liquid. Over all the cake is delicious

  2. 5 stars
    I made this yesterday, as I have a bounty of fresh Meyer Lemons on my trees.
    I don’t have three square 8″ pans, but I have two 8″ round pans, so I figured I could just use those and have two layers.
    The better looked VERY thick and even baked, looking more like cornbread. It’s a solid and dense cake. I can see why three thinner layers would work well. And it was a little dry. It might benefit from some sour cream or other moisture, or perhaps using only almond flour. I don’t know what benefit using coconut flour brings to this recipe.
    It was really delicious, though, and I’d make it again. I would add something – heavy cream? – to make it a little more moist. The frosting is delicious and you could eat it with a spoon. 🙂

  3. 4 stars
    Flavor was yummy! My cake itself was very dense and did not rise at all. The consistency was very thick. I was looking at the other comments and saw some had the same problem. While I did use all room temperature ingredients, my bowl was cold-ish and I think that cooled down all the ingredients again. Maybe warming up the bowl you mix in will help someone else!

About me

Hello! My name is Ioana Borcea, and I'm here to provide you with mouthwatering recipes. This blog is all about sharing my favorite tested easy to make, delicious low-carb & keto, nutrient-dense recipes.

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