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Keto Peanut Butter Mug Cake: Easy Keto Dessert With Coconut Flour

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Looking for a sweet keto treat? Fall in LOVE with our Quick Easy Keto Peanut Butter Mug Cake Recipe – a dream for your tastebuds! This gluten free, sugar free, dairy free dessert recipe is ready in minutes! Perfect for those late-night cravings! Enjoy your keto journey with a pinch of sweetness!

Table of Contents

Understanding Keto Diet

Understanding the Keto Diet

The ketogenic or keto diet is a low-carb, high-fat diet that requires one to significantly decrease carbohydrate intake and replace it with fat. This reduction in carbohydrates puts the body into a metabolic state known as ketosis. Ketosis, in sum, is a state where your body becomes incredibly efficient at burning fat for energy. Because of this, ketogenic diets can cause significant reductions in blood sugar and insulin levels.

Why Certain Ingredients for Keto?

Coconut oil, Swerve, and Coconut Flour are popular choices in Keto recipes due to various reasons related to the principles of the keto diet. Coconut oil is loaded with fats known as medium-chain triglycerides (MCTs) which are easily absorbed and can be used immediately for energy by the body. This can boost the ketone levels in the body and help you enter the state of ketosis.

Swerve is a natural keto-friendly sweetener that has zero net carbs, which means it doesn’t impact your blood sugar or insulin levels. This makes it a suitable replacement for regular sugar in baking and other recipes on the ketogenic diet.

Coconut flour is a great alternative to regular flour in Keto recipes as Coconut flour is low in carbs and high in fiber.

Image of a keto peanut butter mug cake
Keto Peanut Butter Mug Cake

Keto Peanut Butter Mug Cake Baking Basics

Begin the Keto Peanut Butter mug cake recipe by gathering all the necessary ingredients – the full list in the recipe card below. Each ingredient has its own vital role in making the cake.

Firstly, grab a microwave safe mug to prepare your cake. Mix the dry ingredients, which include coconut flour, Swerve, Himalayan salt, and baking powder. Baking powder acts as a leavening agent. It reacts with other ingredients to produce carbon dioxide, which aids the cake in rising. Swerve is a sweetener that is a crucial part of the cake as it gives the mug cake a dessert-like sweetness without the added sugars. A pinch of Himalayan salt will heighten the other flavors in the cake.

Next, add the wet ingredients to the mix. Including a medium-sized egg that is at room temperature. The role of eggs in cake-making is crucial as they help bind the ingredients together and add moisture to the cake.

Crack the egg into the mug, ensuring there are no shell fragments. With the egg, add the vanilla extract. Vanilla extract enhances the flavor profile of the cake, giving it a fuller, richer taste.

Then, add 1 tbsp of melted coconut oil, a healthier fat alternative that also enhances the flavor and texture of the cake.

Lastly, mix in the star of the show, 1 tbsp 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.

Once the batter is ready, microwave it. The appropriate time would range from 60-90 seconds, depending on your microwave wattage. Step back and watch your mug cake bake quickly and efficiently in the microwave.

Monitor your mug cake’s progress by watching it rise in the microwave. If it starts to spill over, stop the microwave, let the cake fall, and then continue cooking.

Once done, let it cool for a few minutes. Enjoy your delicious, quick, and easy keto peanut butter mug cake!

My Keto Diet Journal for Beginners: Macros & Meal Tracking Log Ketogenic Diet Food Diary

Mug Cake Techniques

Choosing the Right Mug

When it comes to making a mug cake, the size of your mug matters. A standard-sized 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.

You can find my favorite mugs for baking keto mug cakes here!

Have A Break Have A Mug Cake Mug
Have A Break Have A Mug Cake Mug

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.

Cooking Time and Microwave Wattage

The cooking time for a mug cake is significantly less than for a traditional cake. For a mug cake, you’ll typically cook it in the microwave for around 1-2 minutes. However, the exact time may vary depending on the wattage of your microwave.

Microwaves with wattage ratings around 800W to 1200W are ideal for cooking mug cakes. A higher wattage will cook your cake more quickly, so you may need to adjust your cooking time accordingly. Start with one minute and add more time as needed, in 15-second intervals, checking for doneness each time. 

With these techniques and tips, you should be able to create a delicious Keto Peanut Butter Mug Cake, right in your own kitchen. Bon appétit!

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 1 day. However, please note that the texture might change slightly upon reheating.

Refrigeration: If you want to store the mug cake for a longer period, you can place it 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 3-4 days.

Reheating: To enjoy the leftover mug cake, you can 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, you can 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 2-3 months. When you’re ready to enjoy it, thaw it in the fridge overnight and then reheat in the microwave as needed.

Remember that reheating any baked goods, including mug cakes, might slightly alter their texture. It’s always best to experiment with reheating times to find the perfect balance between warming it up and maintaining its desired texture.

Image of a keto peanut butter mug cake
Keto Peanut Butter Mug Cake

Mug cakes are a great option for the keto diet because they are easy to make and clean up after, and they come in perfect portions. To make a successful mug cake, you need to know the right mug size, the order in which to mix ingredients, and the cooking time. It also helps to know the optimal microwave wattage for the best results. You can use these tips to make a delicious keto peanut butter mug cake. Whether you are new to keto or an experienced cook, the key to successful keto baking is to be authentic, educated, and knowledgeable. Remember these tips and techniques to have a great experience cooking keto desserts. So let’s turn off our microwaves and end our exploration into the world of keto mug cakes!


Keto Peanut Butter Mug Cake With Coconut Flour

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Recipe by Rally Rus Course: DessertCuisine: AmericanDifficulty: Easy


Prep time


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Net carbs


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Keto Peanut Butter Mug Cake Recipe: Your Go-To Keto Mug Cake & Dessert Recipe - only 5g net carbs!
Looking for a sweet keto treat? Fall in LOVE with our Quick & Easy Keto Peanut Butter Mug Cake Recipe - a dream for your tastebuds! This gluten free, sugar free, dairy free dessert recipe is ready in minutes! Perfect for those late-night cravings! Enjoy your keto journey with a pinch of sweetness!

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  • 1 tbsp 7 g coconut flour

  • 1/4 tsp 1 g baking powder

  • 1 tbsp 15 g Swerve

  • 1 pinch 1 pinch Himalayan salt

  • 1 1 egg

  • 1 tbsp 15 g coconut oil

  • 1 tbsp 16 g peanut butter

  • 1 tbsp 10 g peanuts

  • 1/2 tsp 2 g Vanilla extract


  • 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.


Recipe Video


  • 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.

Nutrition Facts

  • Serving: 1g
  • Calories: 360kcal
  • Carbohydrates: 9g
  • Protein: 13g
  • Fat: 32g
  • Fiber: 4g

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