Keto Birthday Mug Cake

Keto Mug Birthday Cake

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Prep: 5 mins
Cook: 1 mins
Total: 6 mins
Serving: 1 serving
Yield: 1 mug cake

Most days of the year aren't your birthday, but that doesn't mean you don't deserve a mini birthday cake regardless! Mug cakes are one of the easiest and quickest ways to enjoy a festive dessert treat. They're individually-sized cakes that are mixed without much equipment, then baked in a microwave. From start to finish, a mug cake is ready to eat just a few minutes, making it the ideal treat to satisfy hangry cravings.

Typically wheat flour and sugar are the base for mug cakes, but we've swapped the wheat flour for a blend of almond and coconut, and the sugar for a non caloric granular sweetener to make this keto-friendly.

While this vanilla cake is perfect on its own and has a fun birthday vanilla feel, adding sprinkles will enhance its party vibe. There are numerous brands of sugar free, keto diet friendly sprinkles available online.


  • 2 tablespoons almond flour
  • 1 tablespoon coconut flour
  • 1 tablespoon plus 1 teaspoon keto granulated sweetener
  • 1/2 teaspoon baking powder
  • 1/8 teaspoon salt
  • 1 large egg, beaten
  • 1/2 teaspoon vanilla
  • 1 tablespoon butter, melted
  • 1 tablespoon heavy cream
  • 1 tablespoon keto sprinkles, optional

Steps to Make It

  1. Gather all the ingredients.

  2. Mix all of the dry ingredients in a small microwavable mug or bowl. Add the wet ingredients and stir well to combine. Gently stir in the sprinkles, if using.

  3. Microwave the cake on high for 1 minute. Let cool slightly before eating. Serve on its own or topped with a keto-friendly whipped cream or frosting.

Recipe TIps

  • The most common issue for mug cake is overcooking, making the cake dry. To make sure your cake is moist, begin by microwaving the cake for 45 seconds instead of 1 minute. Add 5 second increments after that, in case a full 60 seconds is too long.
  • Because the vanilla is the main flavor of this cake, it's helpful to use a high quality extract. Choose real vanilla over an artificial vanilla flavor if possible. Additionally, an alcohol-based extract will have a more true vanilla taste than a glycerin-based vanilla flavoring.

Mix it up!

You can stir in a variety of goodies and mix-ins to the batter before microwaving. Items that work well and keep this keto-friendly include:

  • 1 tablespoon sugar free white chocolate chips
  • 1 tablespoon sugar free dark chocolate chips
  • 1 teaspoon crushed nuts, such as pecans or walnuts
  • 1/2 teaspoon small seeds, such as sesame or poppy seed

Top it off!

  • If you'd like to frost this cake, let it cool for at least five minutes before doing so.
  • The quickest option that would work well for frosting is heavy cream whipped with a powdered keto sweetener.
  • If you'd like to take the time to make frosting, try one of these (note that you will have at least 2 servings extra on hand for future mug cakes):
  • Sugar-Free Maple Cream Cheese Frosting
  • Keto Chocolate Mousse

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