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Low-Carb Chocolate Peanut Butter Mug Cake

This low-carb chocolate peanut butter mug cake recipe makes me think I should rename this blog Indulgent Mug Cakes without as Many Carbs. That doesn’t exactly roll off the tongue now, does it?

In any case, this chocolate peanut butter cake in a mug is still easy to make. Yes, there are a few more steps than what it takes to make a keto chocolate mug cake, but it’s worth it when you’re craving a scrumptious microwave dessert.

Chocolate peanut butter cake in a blue ramekin with peanuts and chocolate chips on the table.

Keto Chocolate Peanut Butter Mug Cake in Minutes

Chocolate and peanut butter are the soulmates of the dessert world, am I right? The rich and creamy combo is so good in many forms of dessert. So, how can we enjoy the decadent duo while on a low-carb diet?

The easy answer is portion control. No, you do not want to make a whole sheet pan of this cake. You want a peanut butter and chocolate dessert for one, so it’s satisfying without leaving you tempted to go back for extra servings.

At 10.8 net carbs, this is another one of the microwave dessert recipes to make when you want a special treat. Skip the topping if you’d like to save 3 net carbs. (See below for more notes on the topping.)

Egg, peanut butter, chocolate chips, and other ingredients for chocolate peanut butter mug cake on a table.

Chocolate Peanut Butter Cake in a Mug Ingredients

(Measurements are in the printable recipe card below.)

For the mug cake:

  • Almond flour
  • Coconut flour
  • Cocoa powder
  • Granular erythritol
  • Keto-friendly chocolate chips
  • Baking powder
  • Low-carb milk alternative
  • Sour cream
  • Egg
  • Peanut butter
  • Vanilla extract

For the topping:

  • Melted peanut butter
  • Melted keto chocolate chips

Peanut Butter Chocolate Keto Mug Cake Directions

In a microwave-safe mug that’s at least 8 ounces, mix together the almond flour, coconut flour, cocoa powder, granular erythritol, chocolate chips, and baking powder until well-combined.

Dry ingredients for mug cake being mixed with a fork.

Add in the milk, sour cream, egg, peanut butter, and vanilla. Stir until fully incorporated.

Batter for chocolate peanut butter cake.

Microwave for one minute or until the top of the cake is set.

Cooked chocolate pb mug cake with chips in a little scooper.

Melt the additional peanut butter and chocolate chips to drizzle on the top of the chocolate peanut butter cake.

Chocolate glaze for chocolate peanut butter cake in a mug.

Add additional sugar-free chocolate chips to the top if you choose.

Drizzling on peanut butter onto mug cake.

Savor the flavor of this extra indulgent and filling dessert treat!

Chocolate peanut butter cake in a mug by chips and peanuts.

Chocolate Peanut Butter Mug Cake Recipe Notes and FAQ

Peanut butter chocolate mug cake in a ramekin by mini chips.

Do I have to add the topping to this chocolate peanut butter mug cake?

No, you do not have to add the chocolate and peanut butter drizzle to the top of this mug cake. However, the peanut butter flavor in the cake is pretty subtle. You will want extra peanut butter flavor, so you can simply drop a blob of peanut butter and some chocolate chips onto the hot mug cake and let it melt on its own. It’s not as pretty, but that’s fine if you’re not taking pictures!

Chocolate peanut butter mug cake with drizzles and chips on a table.

What kind of peanut butter is keto friendly?

You want to look for peanut butter that has one or two ingredients at most. The ingredients should list peanuts and possibly salt. Stay away from peanut butter that contains xylitol because it’s deadly to pets and you don’t need sweetened peanut butter in this mug cake recipe.

Fork stuck in a peanut butter chocolate mug cake with glaze and mini chips.

What kind of sour cream is keto friendly?

It’s important to choose full fat sour cream for keto recipes. Low-fat or nonfat sour creams are not keto friendly. Double check the nutrition facts before using your sour cream in this mug cake recipe.

Fork of chocolate mug cake with peanut butter drizzle.

Can I make this mug cake into a full cake?

Making this mug cake into a full cake is not tested. This site is all about quick and easy mug cakes for one person. Since portion control is a big part of a keto diet, I like to take the temptation of a full cake out of the equation. Eating several servings of keto desserts can blow your macros and cause digestion issues from all the keto sweetener.

Chocolate peanut butter cake in a blue ramekin with peanuts and chocolate chips on the table.
Yield: 1 mug cake

Keto Chocolate Peanut Butter Mug Cake

Prep Time: 3 minutes
Cook Time: 1 minute
Total Time: 4 minutes

A decadent chocolate and peanut butter mug cake for one to enjoy on a low-carb diet.

Mug cake and all the topping: 10.8 net carbs.

Ingredients

Chocolate Peanut Butter Mug Cake

  • 3 Tablespoons almond flour
  • 1 Tablespoon coconut flour
  • 1 Tablespoon cocoa powder
  • 1 Tablespoon granular erythritol
  • 1 Tablespoon sugar-free chocolate chips
  • 1/4 teaspoon baking powder
  • 2 Tablespoons low-carb milk 
  • 1 Tablespoon sour cream
  • 1 egg, lightly beaten
  • 2 teaspoons peanut butter
  • 1/2 teaspoon vanilla

Topping

  • 1 Tablespoon peanut butter, melted
  • 1 Tablespoon sugar-free chocolate chips, melted

Instructions

  1. In an 8 ounce, microwave-safe mug, mix together the almond flour, coconut flour, cocoa powder, granular erythritol, chocolate chips, and baking powder until well-combined.
  2. Add the milk, sour cream, egg, peanut butter, and vanilla. Stir until fully mixed.
  3. Cook in the microwave for 1 minute or until the top of the cake sets.
  4. Melt additional peanut butter and chocolate chips to drizzle on the top.

Notes

Nutrition facts calculated using Carb Manager and are not guaranteed to be 100% accurate.

Main nutrition facts include the cake and the topping.

Cake alone is 7.7 net carbs.

If you use all the topping it's an additional 3 net carbs.

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Nutrition Information:

Yield:

1

Serving Size:

1 mug cake

Amount Per Serving: Calories: 571.3Total Fat: 43gCholesterol: 196.5mgCarbohydrates: 46.7gNet Carbohydrates: 10.8gFiber: 24gSugar: 4.8gSugar Alcohols: 12gProtein: 20.3g

Did you make this recipe?

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Fork with chocolate peanut butter mug cake.

Let me know how you like this keto chocolate peanut butter mug cake!

Kim

Friday 18th of June 2021

this was absolutely delicious. I have been keto and struggling with late night sweet tooth and this really hit the spot. i may or may not have made it three times. figured it was time to come and leave a comment.

Jen Soltys

Friday 18th of June 2021

I'm so happy that you did! This site is still pretty new, so I appreciate the feedback. So thrilled that you liked it! I know that late night sweet tooth all too well. ;)

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