Kirbie's Cravings

Flourless Peanut Butter Mug Cake

This single serving microwave flourless peanut butter cake comes out light and fluffy. You won’t miss the flour at all!
photo of flourless peanut butter mug cake

I had the biggest craving for a peanut butter flavored dessert today, so I whipped this up. The recipe is just 4 simple ingredients that you likely have in your kitchen and the cake stays moist for hours so you can enjoy it right away or later on too.
overhead photo of flourless peanut butter mug cake
Do you have a recurring nightmare that you’re still in school and suddenly it’s finals and you’re completely unprepared? Even though I’ve been out of school for a decade, I still periodically have that nightmare. I wonder when, or if ever, it will go away.

I recently have been having a similar series of panic moments over my upcoming book. It’s been a few months now since I turned in the final draft, and every once in a while, I’ll find myself freaking out because I think I messed up one of the recipes even though I tested and retested all the recipes over and over again before turning in the book. That’s what happened when I made this mug cake. I looked up the recipe and noticed that the original recipe I posted two years ago and the one in the book are different.

photo of a spoon dipping into a flourless peanut butter mug cake

So I started panicking, but luckily, it was all for nothing. The recipe does work as written (just like all the other ones I recently freaked out over). It is one of the ones I tinkered and improved upon for the upcoming book.

I really enjoy how easy this recipe is. It expands quite a bit in the microwave before deflating a little after it has cooled. It has a sweet, pleasant peanut butter flavor. It also continues to stay moist for hours and the peanut butter flavor actually becomes more prominent if you let it sit for a few hours, though it tastes great straight from the microwave too.

flourless peanut butter mug cake in a blue mug

You can check out my whole collection of mug cake recipes here.

As mentioned above, this recipe is featured in my new cookbook of nearly 100  mug cakes!

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Update! This recipe is now updated with video.

Flourless Peanut Butter Mug Cake

Servings: 1
Prep Time: 4 minutes
Cook Time: 1 minute
Total Time: 5 minutes
Course: Dessert
Cuisine: American
A single serving flourless peanut butter mug cake that cooks in the microwave!
5 from 2 votes

Ingredients

  • 2 tbsp peanut butter creamy
  • 1/8 tsp baking powder
  • 1 tbsp white granulated sugar
  • 1 large egg

Instructions

  • Whisk all ingredients into an oversized, microwave-safe mug until batter is smooth. Microwave for about 1 minute. Let cake cool a few minutes before eating.

Video

Nutrition

Serving: 1mug cake, Calories: 312kcal, Carbohydrates: 20.3g, Protein: 13.4g, Fat: 21.2g, Saturated Fat: 4.9g, Polyunsaturated Fat: 5g, Monounsaturated Fat: 10.1g, Cholesterol: 186mg, Sodium: 208mg, Fiber: 1.6g, Sugar: 16g, NET CARBS: 19g

The nutrition information provided are only estimates based on an online nutritional calculator. I am not a certified nutritionist. Please consult a professional nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.

Did you make this recipe?I'd love to see it! Mention @KirbieCravings and tag #kirbiecravings!

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98 comments on “Flourless Peanut Butter Mug Cake”

  1. So yummy! Just enough of a peanut buttery treat 🙂

  2. Can you do the same with almond butter. Allergic to peanuts

  3. I just made this with no-sugar added peanut butter, and replaced the sugar with Swerve for a low-carb/keto version. It was excellent!

  4. This was amazing! This is the best mug cake I have ever had. Thank you for posting!

  5. Thank you so much Kirbie!
    I love cake, my husband isn’t a fan tho so I don’t often bake myself unless we are having visitors. Today I had a craving for cake and I remembered mug cakes from years ago and started looking for a recipe. Luckily for me I found your website and while looking around I found your 2 flourless peanut butter mug cakes and thought I had to give 1 a try.
    I must admit I couldn’t quite get my head around a flourless cake ahead of making it myself.. I ad libbed a bit as I think my eggs aren’t quite as large as they should be and the consistency wasn’t the same as in your video.
    Wow!! I couldn’t believe it when it came out so well! This was perfect!!
    I am definitely going to try more of your recipes 🙂

  6. I followed the written recipe, adding some chocolate chips and it was PERFECT! I did notice that your video shows to use baking soda and the written recipe says to use baking powder, I used baking powder for perfect results. That might be why some people commented that they got different results.

  7. Cake for breakfast?! I think so. I subbed monk fruit sweetener blend for the sugar. Loved it! So quick and easy. Used my pampered chef ceramic egg cooker without the lid in place of a mug. 

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