Keto Mug Cake – Healthy Recipes Blog

This keto mug cake is incredible. The fluffy crumb, the rich frosting – it’s such a wonderful indulgence and it’s ready in 10 minutes!

If you make it without the frosting, it makes a great breakfast or snack cake. With the frosting, it’s a rich dessert that’s best divided between two.

Keto mug cake served on a white plate with a small cake fork.

I love baking cakes! A few of my favorites are keto chocolate cake, keto birthday cake, and almond flour cake. But sometimes you want something truly fast.

That’s why I love making mug cakes. It never ceases to amaze me, the magic that happens inside the microwave to turn a small ramekin filled with a quickly-mixed batter into an actual, real, delicious cake.

In this recipe, I decided to take it up a notch and added frosting. As a result, this keto mug cake is incredible! It’s a true indulgence that’s ready in minutes, and I love the built-in portion control of making such a small cake.

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Ingredients

I only use a few simple ingredients to make this keto mug cake. The exact measurements are listed in the recipe card below. Here’s an overview of what you’ll need:

  • Cream cheese: Make sure to use a cream cheese block rather than a tub of cream cheese spread.
  • Stevia glycerite: I love this sweetener. It nearly eliminates the aftertaste typical of stevia sweeteners. But if you wish, you can use a granulated sweetener in the cake and a powdered sweetener in the frosting instead of using stevia.
  • Vanilla extract: Make sure to use pure vanilla extract.
  • Butter: I use unsalted butter and prefer to use the Kerrygold brand.
  • Egg: I use large eggs in most of my recipes, this one included.
  • Coconut flour: Try to measure it by weight and not by volume. It’s very absorbent, so each gram makes a difference.
  • Cinnamon: I love it in this cake! It makes a big difference, so please don’t skip it.
  • Baking powder: Make sure it’s fresh and not expired. If you need it to be gluten-free, please verify that it is.
The ingredients needed to make a keto mug cake.

Variations

The best way to vary this recipe is to experiment with different flavor extracts. So instead of using vanilla extract, you could try using almond extract or perhaps orange extract (possibly omitting the cinnamon if you do).

As mentioned above, you can also use a granulated or powdered sweetener instead of stevia.

Keto Mug Cake Instructions

It’s easy to make this fabulous cake! So easy in fact that I make it quite often. The detailed instructions are listed in the recipe card below. Here’s an overview of the steps:

To make the frosting, soften the cream cheese in the microwave for about 10 seconds. Mix in the stevia and vanilla. Set aside.

Mixing frosting for keto mug cake.

Now, place the butter in a ¾-cup, 3.5-inch ramekin. Melt it in the microwave in two 10-second sessions.

Using a small hand whisk or a fork, whisk in the stevia, vanilla, and egg until well incorporated.

Add the coconut flour. Whisk until smooth, scraping the sides and bottom and making sure the batter is completely smooth.

Mix in the cinnamon, followed by the baking powder.

A four-photo collage showing how to mix the batter for a keto mug cake.

Microwave the cake for about 90 seconds, just until a toothpick inserted in its center comes out clean.

Carefully remove the ramekin from the microwave. Use oven mitts – it will be hot. Place it on a heatproof cutting board.

Gently remove the cake from the ramekin. Allow it to slightly cool.

To frost the cake, slice it in half crosswise. Frost the center, then the top and sides, as shown in the video below.

A six-photo collage showing how to frost a keto mug cake.

Expert Tip

After you add the coconut flour, the batter will be quite lumpy. It takes time and patience for the batter to become smooth, so just keep mixing. It takes a few minutes, but eventually, it WILL happen.

Cake batter turning from lumpy to smooth.

Recipe FAQs

Is this really two servings? It looks small.

This is actually a fairly large cake. Without the frosting, I do consider the entire cake as a personal cake, but with the frosting, it’s so rich and filling, that truly, half of it is the perfect serving size.

Can I use a sweetener other than stevia?

Yes. You can use two tablespoons of any granulated sweetener in the cake. In the frosting, it’s best to use a tablespoon of powdered sweetener.

I don’t recommend using a liquid sweetener other than stevia unless you’re prepared to experiment with adding more coconut flour.

Can I substitute almond flour for coconut flour?

No, unfortunately, you can’t. These flours act very differently in baked goods and are not interchangeable.

Serving Suggestions

As mentioned above, you can make this cake without the frosting – it’s very good – and then you can have it for breakfast or as a snack cake.

Once you add the frosting, it’s certainly appropriate as a rich dessert. In fact, I find that it’s so rich and filling that I prefer to divide it into two servings and share it with my husband.

Storing Leftovers

The entire idea of a mug cake is that you don’t have any leftovers… built-in portion control.

But since this cake actually makes two servings, you can keep one of them in the fridge, in an airtight container, for 2-3 days. Remove it from the fridge about 30 minutes before enjoying it.

Keto mug cake served on a white plate with a cake fork.

More Mug Cake Recipes

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Recipe Card

Keto mug cake served on a white plate with a fork.

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Keto Mug Cake

With its fluffy crumb and rich frosting, this keto mug cake is a wonderful indulgence that’s ready in about 10 minutes.

Prep Time10 minutes

Cook Time2 minutes

Total Time12 minutes

Course: Dessert

Cuisine: American

Diet: Gluten Free

Servings: 2 serving

Calories: 200kcal

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Instructions

  • Make the frosting: Place the cream cheese on a microwave-safe plate. Soften it in the microwave for about 10 seconds. Mix in the stevia and vanilla extract. Whisk with a small fork until smooth. Set aside.

  • Place the butter in a microwave-safe ¾-cup, 3.5-inch ramekin (the one I use is similar to this one). Melt it in the microwave in two 10-second sessions.
  • Using a small hand whisk or a fork, whisk in the stevia, vanilla, and egg until well incorporated.

  • Add the coconut flour. Whisk until smooth, scraping the sides and bottom and making sure the batter is completely smooth, well incorporated, and free of lumps. Especially check the bottom of the ramekin to make sure there are no unmixed areas there.

  • Mix in the cinnamon, followed by the baking powder.

  • Microwave the cake for about 90 seconds, just until a toothpick inserted in its center comes out clean.

  • Carefully remove the ramekin from the microwave. Use oven mitts – it will be hot. Place it on a heatproof cutting board.

  • Gently remove the cake from the ramekin. Run a knife around the edges and slide a small rubber spatula under the bottom if needed. Turn the cake upside down to allow the bottom to air out and prevent sogginess. Allow it to slightly cool.

  • To frost the cake, slice it in half crosswise. Frost the center, then the top and sides, as shown in the video below.

  • Cut the cake into two servings and enjoy!

Notes

After you add the coconut flour, the batter will be quite lumpy. It takes time and patience for the batter to become smooth, so just keep mixing. It takes a few minutes, but eventually, it WILL happen. You can keep the leftovers in the fridge, in an airtight container, for 2-3 days. Remove them from the fridge about 30 minutes before enjoying them.

Add Your Own Notes

Nutrition per Serving

Serving: 0.5cake | Calories: 200kcal | Carbohydrates: 4g | Protein: 5g | Fat: 18g | Saturated Fat: 11g | Sodium: 129mg | Fiber: 1g | Sugar: 2g

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DisclaimersMost of our recipes are low-carb (or keto) and gluten-free, but some are not. Please verify that a recipe fits your needs before using it. Recommended and linked products are not guaranteed to be gluten-free. Nutrition info is approximate and the carb count excludes non-nutritive sweeteners. Nutrition info may contain errors, so please verify it independently. Recipes may contain errors, so please use your common sense when following them. Please read our Terms of Use carefully before using any of our recipes.

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