Kirbie's Cravings

Keto Vanilla Mug Cake (Just 4 Ingredients!)

This low carb and keto-friendly vanilla cake cooks in just 1 minute. The cake comes out fluffy, moist and sweet. You only need four ingredients and less than five minutes to make it.
keto vanilla mug cake.

With the weather starting to warm up, I’m trying to make more desserts that don’t require turning on my oven. I love making mug cakes when I’m short on time and am craving something sweet.


  • Superfine Almond Flour
  • Egg
  • Granular sugar alternative
  • Vanilla

Superfine Almond Flour: I recommend using blanched superfine almond flour. You want to use superfine almond flour because the texture is finer and more like flour. Using blanched almond flour will also help with the appearance of the cake. If you need a substitute for almond flour, I have a mug cake made with coconut flour.

Egg: The egg is used to provide structure for the cake. It helps the cake rise and also binds the flour together so that the cake crumb is not too loose. I do use egg for a lot of my keto mug cake recipes because it acts as a binding agent. If you need an eggless keto mug cake, try my keto brownie mug cake.

Granular Sugar Alternative: I use Lakanto Classic Monk Fruit Sweetener or Erythritol granular. Other similar granular sugar alternatives should also work.

Vanilla: Vanilla is used to provide the vanilla flavoring for this cake.

How to Make Keto Vanilla Mug Cake

All the ingredients are added to a microwave-safe mug. The ingredients are then whisked together until the batter is uniform. The cake then cooks in the microwave for about 1 minute. Let the cake cool and it’s ready to be eaten. You can also top with some whipped cream or frosting before serving.
A spoon lifting out some of the cake from the mug.


It’s best to cook this cake in an oversized mug because the cake will rise high while it is cooking before settling back down once it is done.

If you want to make a nicer presentation, you can serve the cake in a smaller mug or plate once it is done cooking.

You do not need to grease the mug before adding the ingredients. The cake will pull away from the sides of the mug.
a keto cake in a white mug.

More Keto Mug Cakes

Keto Vanilla Mug Cake

Servings: 1 cake
Prep Time: 3 minutes
Cook Time: 1 minute
Total Time: 4 minutes
Course: Dessert
Cuisine: American
This keto-friendly vanilla mug cake is easy to make and comes out fluffy and moist. It is just 4 ingredients.
4.67 from 3 votes


  • 1/4 cup (28 g) superfine blanched almond flour
  • 1 tbsp (12 g) Lakanto Classic Monk Fruit Sweetener or Erythritol Granular
  • 1 large egg
  • 1/4 tsp (1 ml) vanilla


  • Add all ingredients into a large microwave-safe mug. Mix with a small whisk until the batter is uniform and the egg is completely beaten and incorporated into the batter.
  • Cook the cake in the microwave at full power for about 1 minute. Cooking time may vary depending on your microwave wattage. My microwave is 1100 watts.
  • Let cake cool a few minutes before consuming. You can plate the cake in a smaller plate or mug before eating. You can also top cake with your favorite frosting or whipped cream.


  • The cake will only fill about 1/3 to 1/2 of a large mug when it is done. However, you do want to use a large mug to cook it because it rises high while it is cooking before it settles back down.
  • So you can see the cake more clearly in the photos, I made double the recipe and plated the cake in a smaller mug for the pictures.
  • Make sure the egg is thoroughly beaten otherwise your cake will not turn out right.
  • If you do not want to use a microwave, you can try baking the cake in the oven at 350F for about 15-20 minutes.
  • This cake is lightly sweetened. If you prefer sweeter desserts, you can add 1 tsp extra sugar substitute to the batter. Or you can top the cake with a sweet frosting.
  • I use either Lakanto Classic Monk Fruit Sweetener * or Erythritol Granular when making this cake. 
  • *This product link is an affiliate link. This means I earn a small commission from qualifying purchases
  • Nutrition estimate is calculated using erythritol granular.
  • If you are on a keto diet, please remember to look at net carbs and not just total carbs in the estimated nutrition. The net carbs count excludes fiber and sugar alcohols (carbs from erythritol).


Serving: 1cake, Calories: 255kcal, Carbohydrates: 18g, Protein: 6g, Fat: 20g, Saturated Fat: 3g, Sodium: 71mg, Fiber: 3g, Sugar: 1g, Carbs from erythritol: 12g, NET CARBS: 3

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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Recipe Rating

8 comments on “Keto Vanilla Mug Cake (Just 4 Ingredients!)”

  1. I was amazed at the texture and flavor.  Ive tried many keto mug cakes and this is definitely the best I’ve had I enjoyed topped with a tbsp of cream cheese and a handful of blueberries. 

  2. Love it. Very simple and easy to make.

  3. Thanks!
    I’ll definitely be making this for my husband

  4. Great emergency dessert for those days when you need something sweet and fast. I made it in one of those soup bowls with a handle so there was plenty of room for the cake to rise. I just ate it plain but it would be better with some berries and whipped cream.