40-Second Peanut Butter Mug Cake

peanut butter mug cake

When we’re stressed, and in a rush, it’s tempting to over-eat. Or make bad choices. That’s where this mug cake recipe is especially handy. Not only is it delicious, but it takes very little work and is a smarter choice than other common treats.

No, this isn’t the healthiest of desserts. But it’s a better indulgence because:

  • It’s actually big enough to split by two people.
  • There’s some good protein in that peanut butter.
  • But most important: You’re automatically stopped at one serving!

It also comes together in just a couple minutes, using ingredients you usually have around. Enjoy!

Single-Serving Mug Cake



  • 1 egg, beaten
  • 1 Tablespoon brown sugar
  • 1/2 teaspoon baking powder
  • 1 heaping Tablespoon flour
  • 2 Tablespoons peanut butter
  • Optional: dark chocolate chips


  • 1 teaspoon milk
  • 1 Tablespoon powdered sugar


  1. Dump all cake ingredients into a large mug.
  2. Whisk well.
  3. Microwave for 40 seconds.
  4. Mix milk and powdered sugar to make glaze.
  5. Pour glaze over cake (either in mug, or flip cake onto plate and then glaze).

Nutrition Per Serving

350 calories, 20.7g fat, 30.8g carbs, 14.5g protein

(Does not include optional dark chocolate chips.)

Recipe created by Cassie Johnston/@backtoherroots, originally appearing at backtoherroots.com.

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Cassie Johnston is an award-winning food writer and recipe developer living and working in Southern Indiana. Her work has been feature in national publications such as Gourmet Magazine and The Huffington Post. Cassie’s a big fan of strenuous hikes, cheese, watching sports, Brussels sprouts, and craft beer, and she’ll talk your ear off about her love of local food and seasonal eating. She’s obsessed with social media and loves connecting with new friends!