Are you a peanut butter lover? This keto peanut butter mug cake takes only minutes to make! It’s tender and lightly sweetened, making for a wonderful, easy low-carb breakfast or keto dessert.
This delicious low carb peanut butter keto mug cake is my new favorite healthy snack with peanut butter flavor! Enjoy this easy peanut butter cake for a perfect healthy breakfast, a snack, or a quick and healthy dessert!
This gluten-free, sugar-free, dairy-free keto mug cake recipe is ready in minutes! Perfect gluten-free mug cake for satisfying those late-night cravings! Enjoy your keto journey with a pinch of sweetness!
Watch me make this recipe in my quick video – it’s like cooking together in the kitchen!
Ingredients
- coconut flour
- baking powder
- Swerve (sugar substitute)
- Himalayan salt
- egg
- coconut oil
- natural peanut butter
- peanuts
- Vanilla extract

Instructions
Begin the low carb mug cake recipe by gathering all the necessary ingredients – the full list is in the recipe card below.
First, grab a microwave-safe mug or a small bowl to prepare your cake. Mix the dry ingredients, which include coconut flour, Swerve, Himalayan salt, and baking powder.
Next, add the wet ingredients to the mix, including a medium-sized egg that is at room temperature.
Crack the egg into the mug, ensuring there are no shell fragments. With the egg, add the vanilla extract.
Then, add the melted coconut oil.
Lastly, mix in the creamy peanut butter. Be sure to mix well until everything is combined into a smooth batter. Ensure there are no lumps and everything is uniformly combined.
Optional: In addition of peanut butter, you can add sugar-free chocolate chips or pieces of dark chocolate if you prefer a chocolate peanut butter mug cake.
Once the peanut butter mixture is ready, microwave it. The appropriate time would range from 60-90 seconds, depending on your microwave’s wattage.
Step back and watch your mug cake bake quickly and efficiently in the microwave.
Monitor your coconut flour mug cake’s progress by watching it rise in the microwave. If it starts to spill over, stop the microwave, let the cake settle, and then continue cooking.
Once done, let it cool for a few minutes. Enjoy your delicious, quick, and easy keto peanut butter mug cake!

Choosing the Right Mug
When it comes to making a mug cake, the size of your best mug cake mug matters. A standard-sized coffee mug, roughly 8 to 12 ounces, is the best bet for ensuring your cake rises properly and cooks evenly. It also provides enough space for the ingredients to mix together properly.
This is the mug I use!

Order of Mixing Ingredients
The order in which you mix your ingredients can impact the texture of your cake. Start by combining your dry ingredients. Mix these in your chosen mug until they’re well incorporated.
Next, add your wet ingredients. Stir in each one at a time, making sure the previous ingredient is well mixed before adding the next.
Storing Keto Peanut Butter Mug Cake
Immediate Consumption: The mug cake is best enjoyed immediately after it’s prepared, for the freshest taste and texture.
Short-Term Storage: If you have leftover mug cake, you can store it in an airtight container or wrap it with plastic wrap. Keep it at room temperature for up to one day. However, be aware that the texture might change slightly when reheated.
Refrigeration: For longer storage, place the mug cake in the refrigerator. Wrap it in plastic wrap or store it in an airtight container to prevent it from drying out. It can be stored in the fridge for up to three to four days.
Reheating: To enjoy the leftover mug cake, reheat it in the microwave for about 10-15 seconds. Be cautious not to overheat, as it can become rubbery or dry.
Freezing (Recommended): For even longer storage, freeze the mug cake. Wrap it tightly with plastic wrap, place it in a resealable plastic bag, and store it in the freezer. It can be frozen for up to two to three months. When you’re ready to enjoy it, thaw it in the fridge overnight, then reheat in the microwave as needed.
This keto peanut butter mug cake is quick, easy, and perfectly portioned. For the best results, choose the right mug size and follow the steps in order.
Cooking time varies, so adjust for your microwave’s power. These tips will help you make a tasty mug cake. Whether you’re a keto beginner or a pro, remember: be true, learn, and apply your knowledge. Enjoy making and eating keto desserts. That’s a wrap on our keto mug cake journey!

Full-Size Keto Peanut Butter Cake
You can easily transform this mug cake recipe into a full-size keto peanut butter cake. Simply multiply the ingredients proportionally based on the size of the cake pan you’re using.
Preheat your oven to 350°F (175°C), and grease your cake pan with a bit of coconut oil to ensure nothing sticks. Pour your batter into the pan, and smooth it out for an even bake. Pop it into the oven and bake for 18-22 minutes, or until a toothpick inserted into the center comes out clean.
More Keto Mug Cake Recipes To Check
- 10 Low Carb Keto Mug Cakes Recipes You’ll Love
- Keto Mug Cake With Raspberries & Coconut
- Keto Blueberry Mug Cake With Coconut Flour
- Keto Brownie Mug Cake
- Keto Oreo Mug Cake With Coconut Flour
- Keto Chocolate Mug Cake for chocolate cravings
Keto Peanut Butter Mug Cake With Coconut Flour
Equipment
- 1 Spatula
Ingredients
- 1 tbsp coconut flour
- 1/4 teaspoon baking powder
- 1 tbsp Swerve
- 1 pinch Himalayan salt
- 1 medium eggs
- 1 tbsp coconut oil
- 1 tbsp peanut butter
- 1 tbsp peanuts
- 1/2 teaspoon Vanilla extract
Instructions
- Mix your dry ingredients: 1 tbsp coconut flour, 1 tbsp Swerve, 1⁄4 tsp baking powder, and a pinch of Himalayan salt in a microwave-safe mug.
- Stir well to ensure there are no lumps in your mixture.
- Next, add in your wet ingredients: 1 medium egg, 1⁄2 tsp of vanilla extract, and 1 tbsp of melted coconut oil, 1 tbsp softened peanut butter.
- Stir well again to obtain a smooth, homogeneous mixture.
- Place your mug in the microwave and cook it on high for about 1 minute 30 seconds. Keep in mind that microwave power levels can vary, so you might need to adjust the time a bit.
Video Recipe
Notes
- You can use any sweetener in this recipe.
- You can replace the peanut butter with any other nut butter.
- For more information about the ingredients in this recipe, see the detailed instructions above the recipe.
- You can cook the mug cake in a preheated oven to 440F/220C for 12-15 minutes.
- To store any leftover Keto Mug Cake, let it cool down completely first. Then, transfer it to an airtight container and store it in the refrigerator for up to 3 days. To reheat, microwave it for 15-20 seconds until warm.
- Drizzle with sugar-free chocolate syrup for a decadent treat.
- Enjoy alongside a hot cup of coffee or tea for a cozy snack.