A moist, freshly baked flourless keto peanut butter mug cake on a white plate, with a piece on a fork ready to be enjoyed. A mug with ‘Have A Mug Cake’ written on it and scattered peanuts are in the background.

3 Ingredient Flourless Keto Peanut Butter Mug Cake Recipe

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Do you love peanut butter as much as I do? 

One of my favorite ways to enjoy peanut butter is in this quick, simple, and easy mug cake. This keto peanut butter mug cake is made with only 3 ingredients: natural peanut butter, swerve, and an egg.

It’s a delicious low carb, flourless, gluten-free mug cake, ready in less than 5 minutes. It’s perfect for when you have a sweet tooth and need a delicious low-carb dessert.

This keto mug cake recipe also helps me with portion control. It’s a single-serving dessert that satisfies my cravings without tempting me to overeat. This easy recipe also helps me when I’m tempted to have something unhealthy.

I can always make this mug cake really fast to stop me from cheating on my keto diet and continue losing weight.

If you are a peanut butter lover, you will love this keto peanut butter mug cake. It’s moist, fluffy, and full of peanut butter flavor. You can decorate it as you wish, with some whipped cream, dark chocolate chips, or more peanut butter. It’s one of my favorite keto dessert recipes and I’m sure it will be yours too.

If you are following a keto or low-carb diet, you might think that peanut butter is off-limits. 

But that’s not true! 

You can enjoy peanut butter in moderation, as long as you choose a natural, sugar-free, and dairy-free version. 

Peanut butter is rich in protein, healthy fats, and antioxidants, and it can help you feel full and satisfied.

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A close-up view of a moist, flourless keto peanut butter mug cake with a spoonful taken out, served on a white plate with scattered peanuts.
3 Ingredient Peanut Butter Mug Cake

Ingredients

  • 2.5 tablespoons natural peanut butter
  • 2 tablespoons swerve
  • 1 egg
A delicious flourless keto peanut butter mug cake sits on a white plate, surrounded by scattered peanuts. The plate is on a heart-shaped wooden board next to a mug with ‘Have A Break Have A Mug Cake’ written on it, all set against a marble countertop.
3 Ingredient Gluten Free Peanut Butter Mug Cake

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Step-By-Step Instructions

In a small bowl, beat the room temperature egg with a fork or a whisk until fluffy and lighter in color. This will help the healthy mug cake to be airy and not dense.

In a separate microwave-safe bowl, microwave the peanut butter for about 15 seconds, or until it’s melted. Be careful not to overheat it, or it will burn.

Add the swerve to the peanut butter and stir well until dissolved.

Add the beaten egg to the peanut butter mixture and whisk well until smooth and well combined.

Pour the batter into a large, microwave-safe mug and microwave for 90 seconds, or until the cake is cooked through. The cooking time may vary depending on your microwave power and the size of your mug.

Let the cake cools slightly and enjoy!

I’m proud to present my own keto coffee mug design, which I use to bake my yummy keto mug cakes.

Have A Break Have A Mug Cake Mug
Keto Mug Cake Mug - My Own Design for Keto Mug Lovers: Get Yours Now!

This keto peanut butter mug cake is a delicious and easy dessert that you can make in minutes with only 3 simple ingredients. It’s flourless, gluten-free, and low-carb. It will satisfy your sweet tooth without ruining your keto diet.

It’s also a great way to enjoy peanut butter in moderation and to control your portions. You can customize it with your favorite toppings. Enjoy it anytime you crave a cake.

I hope you liked this keto peanut butter low carb mug cake recipe and that you will try it soon. If you do, please let me know how it turned out and what you think of it. I love hearing from you and seeing your creations.

You can leave a comment below or share a picture on Instagram with the hashtag #coachrallyrus.

About Me

Hi, I’m Rally, a passionate food lover and a food blogger, following the keto diet and keto lifestyle since February 2019.

I love creating flavorful and tasty recipes that are keto-friendly, low-carb, sugar-free and gluten-free.

Cooking is my true passion and I enjoy sharing it with you. I hope you find my recipes helpful and inspiring.

Thank you for visiting my blog and happy cooking!

3 Ingredient Flourless Keto Peanut Butter Mug Cake Recipe

0 from 0 votes
Recipe by Rally Rus Course: DessertCuisine: KetoDifficulty: Easy
Servings

1

servings
Prep time

3

minutes
Cooking time

1

minute
Calories

278

kcal
Net Carbs

4.9

grams
Total time

4

minutes

How to make a delicious and easy keto peanut butter mug cake with only 3 ingredients: natural peanut butter, swerve, and an egg.
This healthy peanut butter mug cake is flourless, gluten-free, and low-carb, and it will satisfy your sweet tooth without ruining your diet.
This keto mug cake recipe also helps me with portion control. It’s a single-serving dessert that satisfies my cravings without tempting me to overeat. This easy recipe also helps me when I’m tempted to have something unhealthy. I can always make this mug cake really fast to stop me from cheating on my keto diet and continue losing weight.
This Flourless Keto Peanut Butter Mug Cake has only 4.9 grams of net carbs.

Cook Mode

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Ingredients

  • 2.5 tablespoons 2.5 natural peanut butter

  • 2 tablespoons 2 swerve

  • 1 1 large egg

  • 1 tablespoon 1 natural peanut butter for decoration (optional)

Directions

  • In a small bowl, beat the room temperature egg with a fork or a whisk until fluffy and lighter in color. This will help the healthy mug cake to be airy and not dense.
  • In a separate microwave-safe bowl, microwave the peanut butter for about 15 seconds, or until it’s melted. Be careful not to overheat it, or it will burn.
  • Add the swerve to the peanut butter and stir well until dissolved.
  • Add the beaten egg to the peanut butter mixture and whisk well until smooth and well combined.
  • Pour the batter into a large, microwave-safe mug and microwave for 90 seconds, or until the cake is cooked through. The cooking time may vary depending on your microwave power and the size of your mug.

Recipe Video

Notes

Nutrition Facts

  • Serving: 1g
  • Calories: 278kcal
  • Carbohydrates: 7.8g
  • Protein: 14g
  • Fat: 22g
  • Fiber: 2.9g

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Frequently Asked Questions (FAQ):

Q: How many carbs are in this keto peanut butter mug cake?

A: This keto peanut butter mug cake has only 4.9 grams of net carbs per serving. Here is the nutritional data for one serving of this mug cake:

Calories: 278, Fat: 22 g, Protein: 14 g, Total Carbohydrates: 7.8 g, Fiber: 2.9 g, Net Carbs: 4.9 g

Q: Can I use almond butter instead of peanut butter?

A: Yes, you can use almond butter instead of peanut butter in this recipe. Almond butter is also keto-friendly and has a similar texture and flavor to peanut butter.

However, almond butter has slightly more carbs than peanut butter, so you may need to adjust the amount of swerve accordingly.

Q: Can I add some cocoa powder or chocolate chips to this mug cake?

A: Yes, you can add some cocoa powder or sugar-free chocolate chips to this mug cake if you want a chocolate peanut butter combo for a chocolate peanut butter mug cake.

You can either mix them with the batter or sprinkle them on top of the cake before microwaving. Just make sure to check the nutrition labels and the net carbs content of the ingredients you add.

Q: Is sugar free peanut butter healthier than regular peanut butter?

A: Sugar free peanut butter may have slightly fewer calories and carbs than regular peanut butter. The difference is not significant.

Both types of peanut butter have similar amounts of fat and protein. They provide a good source of essential nutrients, such as vitamin E, magnesium, and potassium.

The main difference is the taste and texture, as sugar free peanut butter may be less sweet and more runny than regular peanut butter.

Q: How can I make a full-size cake with this recipe?

A: If you want to make a full-size cake with this recipe, you can double or triple the ingredients and bake it in a 9×13-inch cake pan. You need to adjust the baking time to about 15-20 minutes and check the cake for doneness with a toothpick inserted in the center. 

Q: Does peanut butter cause acne?

A: There is no conclusive evidence that peanut butter causes acne. Some factors may make it more likely for some people.

For instance, peanut butter is high in omega-6 fatty acids. This can promote inflammation and sebum production. It leads to clogged pores and breakouts.

Some commercial peanut butters also contain added sugars. This can spike blood sugar and insulin levels, triggering acne-causing hormones.

Additionally, some people may have an allergy or intolerance to peanuts or other ingredients in peanut butter, which can cause skin reactions.

To prevent or reduce acne:

  • choose natural or organic peanut butter
  • limit the intake
  • balance it with anti-inflammatory foods, such as omega-3 rich fish, flaxseeds, and nuts.

Q: How long does fresh ground peanut butter last?

A: Fresh ground peanut butter, also known as natural peanut butter, does not have any stabilizers or preservatives. It has a shorter shelf life than commercial peanut butter.

In general, fresh ground peanut butter can last for several months unopened in the pantry, or up to a month once opened.

However, it can last longer if refrigerated, up to a year unopened, or 3-4 months once opened.

To extend the shelf life of fresh ground peanut butter, store it in an airtight container, keep it away from heat and light, and stir it regularly to prevent oil separation.

Q: How to store peanut butter properly?

A: The best way to store peanut butter depends on the type and the frequency of use. 

  • Processed peanut butter, which has stabilizers and preservatives, can be stored in the pantry for up to 9 months unopened, or 2-3 months once opened. Refrigerating it can add 6-9 months of shelf life. 
  • Natural peanut butter, which lacks stabilizers and preservatives, can be stored in the pantry for 2-3 months unopened, or up to a month once opened. Refrigerating it can extend its shelf life up to a year unopened, or 3-4 months once opened. 
  • Powdered peanut butter can last for 10-12 months unopened, or 4-6 months once opened, in the pantry. 
  • Freezing peanut butter is also an option, especially for portion control. Scoop 1 to 2 tablespoons of peanut butter into an ice cube tray, freeze it, and then transfer it to a freezer-safe bag or container. Frozen peanut butter can last for 6-9 months.

Q: Is peanut butter dairy free?

A: Yes, peanut butter is dairy free by definition, as it only contains peanuts and sometimes salt, oil, or sugar. Peanuts are a plant-based food and do not contain any milk or butter.

However, some specialty peanut butters may have dairy ingredients, such as milk powder, whey, or casein, added to enhance flavor, texture, or shelf life.

To ensure that peanut butter is dairy free, always check the label and look for products that are certified vegan or dairy free.

Q: What are some dairy free peanut butter brands?

A: Most peanut butters are naturally dairy free, as they only contain peanuts, oil, and sometimes salt or sugar.

However, some specialty peanut butters may have dairy ingredients, such as milk powder, whey, or casein, added to enhance flavor, texture, or shelf life.

To avoid dairy in peanut butter, always check the label and look for products that are certified vegan or dairy free.

Some examples of dairy free peanut butter brands are Justin’s, PB2, Skippy Natural, and Smucker’s Natural.

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