Kirbie's Cravings

Keto Blueberry Mug Cake

A light and fluffy blueberry cake that is also low carb and keto-friendly. This easy cake cooks in the microwave and is ready in about 5 minutes.

close-up photo of a keto blueberry mug cake

This blueberry-studded mug cake is perfect for summer. It starts with a light and fluffy vanilla cake and is mixed with fresh blueberries. You can also use other berries like strawberries or blackberries.

Coconut Flour

Unlike my Low Carb Snickerdoodle Mug Cake, this cake uses coconut flour. Normally, I like using almond flour in my baked goods. However, coconut flour is needed for this recipe because coconut flour is highly absorbent, resulting in a thicker batter. If you try to add blueberries to an almond flour batter, the berries will fall right to the bottom.
close-up photo of a spoon scooping some blueberry cake

Mug Cake Tips

  • Make sure to carefully measure out the coconut flour. Coconut flour is highly absorbent so adding even a little too much can make the batter dry.
  • This cake rises quite high while it cooks and then will sink back down. I like to cook mine in an oversized mug and then plate it in a smaller mug.
  • The cake is best consumed soon after it is cooked.
  • You can top the cake with powdered swerve.

overhead photo of a blueberry mug cake

If you you’re looking for more keto mug cakes you might like my Keto Peanut Butter Chocolate Chip Mug Cake, too.

Keto Blueberry Mug Cake

Servings: 1
Prep Time: 4 minutes
Cook Time: 2 minutes
Total Time: 6 minutes
Course: Dessert
Cuisine: American
A light and fluffy vanilla mug cake studded with blueberries. This cake is also low carb and keto-friendly.
4.82 from 16 votes


  • 1 tbsp unsalted butter melted
  • 2 tbsp heavy cream see note for substitutes
  • 3/4 tsp vanilla
  • 1 large egg
  • 2 tbsp coconut flour
  • 1 tbsp erythritol sweetener granular
  • 1/4 tsp baking powder
  • 6-8 fresh blueberries


  • In a microwave-safe oversized mug, add all ingredients except blueberries.
  • Mix with a small whisk until batter is evenly mixed. Gently place blueberries on top.
  • Cook cake in the microwave at full power for about 1 minute and 40 seconds. Allow the cake to cool a few minutes before eating.


  • I use an 1100 watt microwave. You may need to adjust time and/or power if you are using a different wattage.
  • The cake works best with heavy cream but if you don't have heavy cream, you can use coconut cream or whole milk. Your cake won't be as rich and fluffy using regular milk but it will still work.
  • I used So Nourished Erythritol Sweetener Granular.*
  • Erythritol sweetener granular can be substitued with swerve granular or similar granular sweeteners.
  • This cake rises quite high while it cooks and then will sink back down. I cooked mine in a 16 oz mug and then plated it in an 8 oz mug.
  • *Some of the links contained in this post are affiliate links. Much like referral codes, this means I earn a small commission if you purchase a product I referred (at no extra charge to you).
  • Estimated Nutrition Information does not include carbs from erythritol


Serving: 1cake, Calories: 361kcal, Carbohydrates: 11g, Protein: 10g, Fat: 30g, Saturated Fat: 18g, Sodium: 124mg, Potassium: 205mg, Fiber: 5g, Sugar: 2g, NET CARBS: 6g

The nutrition information provided are only estimates based on an online nutritional calculator. I am not a certified nutritionist. Please consult a professional nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.

Did you make this recipe?I'd love to see it! Mention @KirbieCravings and tag #kirbiecravings!


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54 comments on “Keto Blueberry Mug Cake”

  1. I just made this and it is delicious. Used swerve brown sugar and it turned out great. Will be making this again!

  2. For those of us that don’t have a microwave, how many minutes at what temp can we bake this in a toaster oven or regular oven? Thanks!

  3. This turned out really good! Next time I will fold the berries into it, rather than leave them on top. A recent diagnosis of type 2 diabetes is changing my eating habits. This recipe fit in very well!

  4. Wonderful!!! Perfect!!! Light and fluffy!

  5. This is by far the best blueberry muffin I have made. Thank you for sharing

  6. One of my all-time favorite keto recipes! I always make this when I’m craving a keto cake. super moist and fluffy with absolutely no eggy taste.

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