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Peanut Butter Mug Cake

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5 from 11 votes

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This easy Peanut Butter Mug Cake comes together in a snap and will satisfy all your sweet + salty cravings! Made with creamy peanut butter, every bite of fluffy cake is full of melty semi-sweet chocolate chips. Top it all off with ice cream or whipped cream!

It’s been a while since I shared a mug cake recipe, so today I’m bringing you a fluffy peanut butter mug cake with chocolate chips. It has the perfect balance of sweet and salty, all mixed together with melty semisweet chocolate chips. I love serving this with vanilla ice cream or a big dollop of whipped cream for the perfect bite!

If you’re new to microwave desserts I recommend checking out some of my previous recipes for details on how to make a mug cake. The beauty of mug cakes is that the process is pretty much the same for every one, you just have to change up the ingredients and ratios to achieve different flavors. For this mug cake, I wanted to hit that classic note of chocolate + peanut butter!

Why You’ll Love this Peanut Butter Mug Cake

  • Easy. Mix all your ingredients together in a large mug, then pop it in the microwave and zap until ready. Add your favorite toppings and dig in.
  • Quick. Start to finish you can make yourself a decadent serving of peanut butter cake in 5 minutes.
  • Salty + Sweet. Adding peanut butter to a mug cake adds and irresistible note of saltiness that’s perfectly complimented by the sweetness from the cake itself and the chocolate chips. It’s super tasty!

Tips for Success

Although the process for making this mug cake is pretty much identical to all my other recipes, there are a few tips I still want to share.

  • Use creamy peanut butter. It is important that you use a creamy peanut butter like Jiffy. A chunky peanut butter or a “natural” one that isn’t quite as smooth won’t blend as well into the mug cake batter.
  • Use a BIG mug. This mug cake is probably one of the biggest ones I make. It cooks up quite tall and fluffy in the microwave so be sure you use a 15-oz mug for this one.
    • If you don’t have a mug that big you could also spoon half of the batter into an 11-oz mug and then make two mug cakes. You will need to reduce the cook time by about ~1 minute if you go this route, but experiment with it and see what works best. Cook times for mug cakes always vary by microwave.
  • Let it cool. I cannot stress this enough. Mug cakes are always super hot when they come out of the microwave so, eager as you are to dig in, resist that urge and let it cool for a couple minutes.
  • Add toppings! I like to add a scoop of vanilla ice cream or a swath of whipped cream right in the mug. You can also scoop the mug cake out into a bowl and then really go to town with your toppings since you’ll have more room. Doing this also lets your mug cake cool faster!

Want to Try More Mug Cakes?

Mug cakes are something of an obsession and I’m slowly working on adding all my recipes to this site. Here are the ones I’ve shared so far:

  • Chocolate Mug Cake – A classic mini chocolate cake in mug form!
  • Vanilla Mug Cake – Another old-fashioned cake that you can quickly throw together in the microwave.
  • Snickerdoodle Mug Cake – This is actually a variation of my vanilla mug cake. Same as with sugar cookies, all you have to do is add some cinnamon to turn a vanilla treat into a snickerdoodle variation!
  • Nutella Mug Cake – If you are a Nutella lover and looking for new ways to use it, I highly recommend a mug cake.
  • Strawberry Shortcake Mug Cake – I love making this when strawberries are in season. This is the perfect treat for when you’re craving strawberry shortcake but don’t want to spend time making the biscuits. This mug cake gives you strawberry shortcake stat!

Peanut Butter Mug Cake

5 from 11 votes
This easy Peanut Butter Mug Cake comes together in a snap and will satisfy all your sweet + salty cravings! Made with creamy peanut butter, every bite of fluffy cake is full of melty semi-sweet chocolate chips.
Prep Time3 minutes
Cook Time2 minutes
Total Time5 minutes
Yield: 1 mug cake


  • 2 tablespoons creamy peanut butter
  • 1 egg yolk
  • 1 tablespoon oil, olive oil or vegetable oil (I used olive)
  • 4 tablespoons milk
  • ½ teaspoon pure vanilla extract
  • 2 tablespoons brown sugar
  • Small pinch of kosher salt
  • 2-3 tablespoons semisweet chocolate chips
  • 4 tablespoons all purpose flour
  • ½ teaspoon baking powder


  • Mix wet ingredients. In a large microwave-safe mug, combine the peanut butter, egg yolk, oil, milk, vanilla, brown sugar, salt, and chocolate chips. Mix well.
  • Add dry ingredients & mix well. Add the flour and baking powder. Mix just until there are no dry ingredients visible. Make sure you get into the nooks of the mug so that no dry ingredients get stuck at the bottom. Don't overmix or the cake will be chewy instead of fluffy.
  • Bake. Microwave for 2 minutes 30 seconds. Cook time will vary according to your microwave so check at the 2-minute mark. The cake is done when there is no wet batter on top and it springs back slightly when you press it gently with a finger.

Cool a few minutes, it will be hot!

  • Serve. Add vanilla ice cream or whipped cream if desired.
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Calories: 790kcal | Carbohydrates: 74g | Protein: 17g | Fat: 49g | Saturated Fat: 14g | Polyunsaturated Fat: 9g | Monounsaturated Fat: 23g | Trans Fat: 0.1g | Cholesterol: 203mg | Sodium: 391mg | Potassium: 528mg | Fiber: 5g | Sugar: 41g | Vitamin A: 372IU | Calcium: 273mg | Iron: 5mg
Nutritional info is an estimate and provided as a courtesy. Values may vary according to the ingredients and tools used. Please use your preferred nutritional calculator for more detailed info.
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Reader Questions and Reviews

    1. Rustic Family Recipes

      You are the second person to ask about the mug in as many days. Who knew it would be so popular! I’m sorry to say I have no idea where I got this mug, I have had it forever. Probably either Amazon, Etsy or maybe even a farmer’s market. 🙂

  1. I’m really excited to make this yummy looking cake, can you tell me who makes that mug, it’s the perfect one for this presentation! Thanks for your help.

    1. Rustic Family Recipes

      Oh goodness, hmmm… I don’t know where I got this mug! I’ve had it forever. Probably Amazon or Etsy if I had to guess, but I have no idea who the seller would have been. I’ve literally had this mug for about 15 years. Sorry I don’t have more info! This mug cake can be made in any appropriately sized mug if that helps at all. 🙂