Low Carb Chocolate Mug Cake

This low carb chocolate mug cake is a warm, single-serving keto dessert that comes together in just a few minutes in the microwave. Almond flour forms a tender, gluten-free crumb while unsweetened cocoa powder delivers deep chocolate flavor and a texture somewhere between cake and brownie. A whole egg provides structure, butter adds richness, and keto-friendly sweetener like erythritol or stevia keeps the cake sweet without sugar or a blood sugar spike. Vanilla extract and a pinch of salt enhance the chocolate, and you can finish it with whipped cream or a few chopped nuts for extra indulgence. Enjoy this cozy, chocolatey treat for a quick weeknight dessert, an individual treat for guests, or even a special low carb breakfast with coffee.

Course Breakfast, Dessert, Snack

Cuisine American

Keyword Chocolate, gluten free, keto, low-carb, microwave dessert, Mug Cake, quick dessert, single serving

Prep Time 4

Cook Time 1

Total Time 5

Servings mug cake

Calories 410kcal

Equipment

Microwave-safe mug
fork or small whisk
measuring spoons

Ingredients

For the chocolate mug cake

3 tablespoons blanched almond flour fine blanched almond flour, not almond meal
1 1/2 tablespoons unsweetened cocoa powder
2 tablespoons granulated erythritol sweetener or preferred keto sweetener, to taste
1 large egg room temperature if possible
2 tablespoons unsalted butter melted and slightly cooled, or use coconut oil
2 tablespoons unsweetened almond milk or other unsweetened low carb milk
1/2 teaspoon vanilla extract
1/4 teaspoon baking powder gluten free and aluminum free if desired
1/8 teaspoon fine sea salt or to taste

Optional add-ins and toppings

1 tablespoon sugar free chocolate chips optional, stirred into the batter
1 tablespoon whipped heavy cream unsweetened or lightly sweetened with keto sweetener, for serving
1 tablespoon chopped pecans or walnuts optional, for topping

Instructions

Lightly grease the inside of a microwave safe mug with a small amount of butter or oil if it is not nonstick.
Add the almond flour, unsweetened cocoa powder, erythritol sweetener, baking powder, and salt to the mug and stir with a fork until the dry ingredients are evenly combined and no cocoa or flour lumps remain.
Add the egg, melted butter, almond milk, and vanilla extract to the mug and whisk with the fork until a smooth, thick batter forms and the egg is fully incorporated.
If using sugar free chocolate chips, gently fold them into the batter, making sure they are distributed throughout the mug.
Microwave the mug cake on high for about 60 seconds, then check the center and continue microwaving in 10 to 15 second bursts until the top is just set and springs back lightly when touched.
Let the mug cake rest for about 1 minute to allow the heat to finish cooking the center and the texture to firm slightly.
Top the warm mug cake with whipped cream and chopped nuts if desired and serve straight from the mug while still warm.

Notes

Microwave strengths vary, so adjust the cook time as needed and avoid overcooking, which can make the cake dry and rubbery. This recipe is written for almond flour, which gives a tender, cake like texture, and swapping in coconut flour is not a straight one to one substitution. For a coconut flour version, use about 1 tablespoon coconut flour in place of the almond flour and add an extra tablespoon of almond milk to keep the batter from becoming too dry. Taste the batter before microwaving and adjust the amount of keto sweetener to suit your preferences, especially if using very concentrated stevia or monk fruit blends. For a molten style center, slightly undercook the cake so the middle stays a bit gooey, or press a teaspoon of nut butter into the center of the batter before cooking. The mug cake is best enjoyed fresh, but you can refrigerate leftovers for up to 2 days and gently reheat in the microwave in short bursts until just warm.

Nutrition