This low carb peanut butter mug cake is yummy and it couldn't be easier. From

Peanut Butter Mug Cake

This quick and and easy, low carb, peanut butter mug cake is light and fluffy with great peanut butter flavor. Just 6.8 net carbs per generous serving. Top it with your favorite low carb topping or just powdered sugar-free sweetener. It’s definitely big enough to share!

For this recipe you’ll need: almond meal, sugar free sweetener (Swerve), monk fruit or stevia works well, baking powder, baking soda, cream of tartar, egg, butter, peanut butter, club soda, and vanilla syrup.

If you are in a hurry click here to go to the recipe.

This low carb peanut butter mug cake is quick and easy - just 6.8 net carbs per serving. From
This low carb peanut butter mug cake is quick and easy – just 6.8 net carbs per serving.

You know what kicks my butt when it comes to low carb eating?

Sweets. Cake, candy, cookies… oh my! And it’s not like I am single and can just keep them out of the house! I have a houseful of skinny kids with gargantuan sugar cravings. My husband, who is Type 1, keeps M&Ms in his nightstand in case his blood sugar tanks during the night. I can’t get away from carbs even in my own bedroom!

It’s not too bad during the day when everyone is at work or school but now school is out and I am going to have all of that snacking happening right in front of me. I knew I was either going to make low carb snacks that were good enough to keep me away from the kids’ sweets and the husband’s stash OR I was going to have a hind-end the size of Texas by the time summer was over.

I prefer the former.

Low carb peanut butter mug cake is a gluten free snack. From
Low carb peanut butter mug cake is a gluten free snack.

So, since I love peanut butter I came up with this peanut butter mug cake. Serves one or two, depending on how hungry you are. It’s a BIG, filling cake. I ate the whole thing but I promise you my stomach is done for the day and it’s only 2 -o-clock. You might want to make it in two mugs if your mugs aren’t huge. I didn’t have a mug that I liked for the pictures so I used a ceramic tart pan. It’s about 6-inches across and 2 1/2-inches deep. It holds a cup of liquid.

If your mugs are on the small side I’d use two of them the first time you make this just to make sure that it doesn’t cascade over the sides in the microwave. It’s also a good idea to put the mug on a plate to catch any possible overflow. If you use 2 mugs cut the cooking time down to about 20 seconds.

I like this just with a dusting of powdered sweetener but it would be amazing with my low carb chocolate spread or caramel sauce.

Low carb peanut butter mug cake is quick and easy. From
Low carb peanut butter mug cake is quick and easy.

Here’s that low carb peanut butter mug cake recipe!

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Peanut Butter Mug Cake

Tender, fluffy peanut butter mug cake takes care of your cravings for sweets in a flash. It is so quick that you can be enjoying this sweet treat in less than 5 minutes! This recipe serves 1 but the cake is large enough (and filling enough!) to share with someone you love. Just 6.8 net carbs for the whole dessert, 3.4 net carbs if you split it. Cook time is 20 to 30 seconds.
Course Dessert
Cuisine American – low -carb, American Classic
Keyword cake, peanut butter
Prep Time 3 minutes
Cook Time 1 minute
Total Time 4 minutes
Servings 1 large mug cake
Calories 574kcal
Author Marye


  • 1/3 cup almond flour
  • 1 tablespoon sugar free sweetener
  • 1/2 teaspoon monkfruit powder or equivalent Stevia
  • 1/2 teaspoon baking powder
  • 1/4 teaspoon baking soda
  • 1/8 teaspoon cream of tartar
  • Pinch of kosher salt
  • 1 egg
  • 2 tablespoons butter
  • 1 tablespoon peanut butter
  • 2 tablespoons club soda
  • 1/4 teaspoon vanilla extract
  • Butter for greasing mug


  • Grease the mug with a light coating of butter.
  • Melt the butter on the stove, watching carefully until it turns a golden brown. If it gets too dark it will be bitter.
  • Let cool to room temperature.
  • Mix the almond flour, sweeteners, baking powder, baking soda, cream of tartar, and salt in a bowl.
  • Blend in the egg, butter, peanut butter, club soda, and vanilla.
  • Spoon into the mug.
  • Microwave on high for 20 to 30 seconds, or until it is just firm on top. Don’t overcook or it will be dry.
  • Remove from the microwave (some shrinkage is normal) and top with your favorite topping.


1 Serving: Calories – 550… Fat – 55.3 …Carbs – 11.8 … Net Carbs – 6.8…Sugars – 3.3 … Protein – 16.5.


Calories: 574kcal | Carbohydrates: 13g | Protein: 18g | Fat: 53g | Saturated Fat: 19g | Polyunsaturated Fat: 4g | Monounsaturated Fat: 11g | Trans Fat: 1g | Cholesterol: 224mg | Sodium: 618mg | Potassium: 437mg | Fiber: 5g | Sugar: 3g | Vitamin A: 937IU | Calcium: 205mg | Iron: 3mg

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10 thoughts on “Peanut Butter Mug Cake”

    1. To sweeten the cake since you can’t use sugar. Using 2 different sweeteners balances the sweetness better, I think.

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