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Peanut Butter Mug Cake Recipe Without Flour

This peanut butter mug cake recipe without flour is delicious for anyone who enjoys desserts. And it’s especially good for anyone who has to be gluten-free. I love the fact that it’s quick and easy to make with ingredients I have in my pantry and fridge.

mug of peanut butter cake without flour

I highly recommend reading this entire post before you begin preparing the recipe. However, if all you want is the list of ingredients with full directions, please either click on the jump-to-recipe button above or scroll to the bottom of this post.

There are several flourless peanut butter cake recipes floating around out there, but this mug cake is perfect when you don’t want to be tempted by a huge cake.

Since I’m a peanut butter junkie, this is something I have to think about.

One of the many things I enjoy about the peanut butter mug cake is the fact that the texture is similar to any other cake.

Another thing I like is the fact that you don’t have to dirty up a bunch of dishes, bowls, and pans since you prepare, cook, and eat it in the same mug.

Jif Peanut Butter Cake Recipe

You can make this recipe with any brand of peanut butter. I’ve tried it with a variety of brands, including generic, and it always turns out. 

However, since I made this one with low-sodium, natural creamy Jif, I wanted to mention it, since different types of peanut butter contain varying amounts of salt, oil, and sugar.


You only need a few ingredients to make this mug cake. In fact, you can make it with the first 3 ingredients on the list below, but I like to add the fourth for a little extra flavor.

Here’s what you’ll need:

  • Peanut butter (creamy)
  • Granulated sugar
  • Egg
  • Vanilla extract (optional)
Jif peanut butter, granulated sugar, egg, and vanilla extract

I’ve only made this recipe with creamy peanut butter. However I think it would be good with a crunchy version. Since I like a lot of texture, I might try that next time.

For exact measurements of each ingredient and full directions, go to the recipe card at the bottom of the page. You can even print out the card by using the “print” button.

How to Make Flourless Peanut Butter Cake Recipe in a Mug

This quick and easy recipe is perfect for those times when you want a quick dessert or a sweet treat. I make other mug cakes, and they’re all good. But there’s just something about peanut butter.

You don’t need any pots or pans to make this recipe. All you need are a mug, a fork, and a microwave.

First, crack the egg directly into the mug. Using your fork, give it a good whisk to break the yolk and mix it with the egg white.

Secondly, scoop the peanut butter and sugar into the mug.

Stir it with the fork until the mixture is creamy.

mixture stirred in a mug

If you decide to use vanilla extract, add it now. I eyeball it to get the amount I think it needs.

But it’s okay if you pour a little more or a bit less. Your treat will turn out good no matter how much you use.

adding vanilla to mixture.

Next, remove your fork and stick the mug with the mixture in the microwave. Cook it on high for 1 minute. 

Finally, remove it from the microwave and set it on the counter to rest. The heat in the mug helps it to continue cooking. Then it needs to cool a little bit, or you’ll burn your tongue.

Now you can dig in. Or you can add some whipped cream or ice cream if you like toppings. This time, I put a little whipped cream on it, but I like it plain just as much.

spoon of peanut butter cake

Additional Ingredients

This mug cake is good as-is. However, if you want to add a tablespoon of flour for a different texture, go ahead and do that while you’re mixing the other ingredients.

Since I have to eat gluten-free foods, I’ve used almond flour or coconut flour. Both work quite well. But I like the flavor of the coconut flour a tad more.

What Type of Mug is Used for Mug Cake?

Since you cook this in the microwave, it’s essential that you use a microwave-safe mug.

The ones I use are ceramic. You can also use Corelle mugs if you have them.

peanut butter cake in a mug with whipped cream.

Never try to cook a mug cake in metal or plastic. The metal will cause sparks, while the plastic might melt from the intense heat from the cake.

This might sound intimidating, but it’s really not. If you heat your coffee in the microwave, the mug you use for that is probably fine. 

4 steps of making peanut butter mug cake

More Delicious Sweet Treats

Around our house, we enjoy a variety of sweets, especially homemade if the recipe isn’t too difficult. So I’ve got a list of go-to desserts that I make when we want them.

I’m really into cookies, so I’ve come up with a wonderful brownie pecan cookie recipe. I start with brownie mix and change the ingredients to make these deliciously crunchy cookies.

Another type of cookie we enjoy is a butterscotch pecan cookie. These are very sweet, and the flavor is out-of-this-world wonderful.

Since I mentioned that I’m a peanut butter junkie, I have to share my flourless peanut butter cookie recipe. It’s actually similar to this mug cake, but it’s just different enough to make cookies.

Another delicious peanut butter treat is this peanut butter fudge. You’ll love that it’s quick and easy, and it only has 2 ingredients.

If you just want something sweet and yummy to munch on while watching TV or enjoying family game night, try these candied pecans. They’re a quick and easy treat that you’ll turn to often when you crave a sweet snack.

People who know me well are aware that I absolutely adore the flavor of pineapple. This delicious pineapple pie is amazing and perfect for those times when you need a refreshing dessert.

Another dessert that’s easy and yummy is this pineapple dump cake. Top it with ice cream for out-of-this-world flavor!

Yield: 1 mug cake

Peanut Butter Mug Cake Recipe Without Flour

peanut butter cake in a mug with whipped cream on top

When you want a single serving of dessert, this peanut butter mug cake hits the spot!

Prep Time 5 minutes
Cook Time 1 minute
Additional Time 2 minutes
Total Time 8 minutes


  • 3 tablespoons of creamy peanut butter
  • 1 tablespoon of granulated sugar
  • 1 egg
  • 1/2 teaspoon of vanilla extract


  1. Whisk the egg on a microwave-safe mug.
  2. Add the rest of the ingredients and whisk until everything is well mixed.
  3. Microwave the mixture on high for 1 minute.
  4. Cool for 2 minutes before serving.


Enjoy it as-is or top it with whipped cream or ice cream.

Nutrition Information



Serving Size


Amount Per Serving Calories 410Total Fat 29gSaturated Fat 6gTrans Fat 0gUnsaturated Fat 18gCholesterol 186mgSodium 301mgCarbohydrates 25gFiber 3gSugar 16gProtein 17g

The nutrition information is a product of online calculators. I try to provide true and accurate information, but these numbers are estimates.

Did you make this recipe?

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Thursday 10th of November 2022

Woozer,I love sweets,but this was too sweet for me. Not the consistency I was expecting. Ok,but not so great.

Miz Helen

Friday 2nd of April 2021

Congratulations, your awesome post is featured on Full Plate Thursday,530. Thanks so much for sharing with us and you have a very special weekend! Miz Helen


Friday 19th of March 2021

Thanks for a great recipe to make when you crave a little something extra after dinner! I will likely add a few chocolate chips to the top of mine!


Friday 19th of March 2021

Hi Gina. I love your idea to add chocolate chips! Thanks for the tip!

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