Peanut Butter Cake in a Mug
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Peanut Butter Cake in a Mug tastes just like a fluffy version of a Nutter Butter cookie. It’s the perfect single-serving dessert, but you can easily make more if friends are over. Mix together crushed cookies with a few staple ingredients and pop your mug in the microwave!
Peanut Butter Cake in a Mug
Mug cakes are perfect for when you want a single serving of something sweet. I’ve been compiling all of the best flavors and recipes like chocolate chip, Oreo, and Funfetti.
For another easy treat, try these delicious no-bake bars that combine chocolate and peanut butter with a crunchy graham cracker crust.
This particular Nutter Butter cake recipe comes out tender and moist without being too rich. It’s got just the right amount of texture and flavor to satisfy any craving.
And to top it all off is a Reese’s peanut butter cup! The heat from the cake causes it to melt into a gooey, chocolatey layer.
Whip up this Reese’s mug cake recipe in a few easy steps and you’ll be back on the couch before the commercial break ends!
Ingredient Notes and Substitutions
- Nutter Butters – These are peanut butter sandwich cookies in the shape of peanuts in the shell.
We’re using them in place of the typical cake batter ingredients, saving time and effort!
Feel free to swap in a different brand, shape, or GF version when making this Nutter Butter cake recipe, as long as you’ve got about 3 tablespoons of crushed cookie crumbs. - Milk – Whatever you have on hand will do, even plant-based milk!
Almond milk will complement the flavor of the cookies, and soy or oat milk are always great substitutes for baking because of their texture and neutral flavor. - Sugar – Granulated sugar adds some sweetness and helps give this the perfect cakey texture.
You’ll also need some powdered sugar to dust over the top of your peanut butter cake in a mug! - Baking Powder – Helps the batter rise and create fluffy results. Don’t try to substitute anything else.
- Reese’s Cup – This is a must in my opinion, but you can make this peanut butter cake in a mug recipe without it.
And to make it really taste like a Reeses mug cake, swap a little bit of the sugar with cocoa powder instead!
Tips and Tricks to Make This Nutter Butter Cake Recipe
- Don’t have a food processor?
Seal the cookies in a Ziploc bag and use a rolling pin or your fingers to crush them instead.
- Adjust cooking time as needed.
Since every microwave is different, check to be sure your peanut butter cake in a mug is fully done in the center.
If not, heat in additional 10-second bursts until it is.
- Enjoy this every night!
Cut down on the prep work by crushing an entire package of cookies at once!
Store them in a sealed container in the pantry, then measure out 1.6 ounces of crumbs (about 3 tablespoons) when you’re ready to make one.
Prep Ahead
- Crush cookies
- Chop Reese’s cup
Kitchen Tools You Will Need
- Food Processor – Use this to turn your cookies into crumbs in seconds.
- Microwave-safe Mug – Any coffee mug should work for this peanut butter cake in a mug recipe, but it doesn’t hurt to check the stamp on the bottom!
Topping Suggestions
While this Reese’s mug cake recipe is certainly delicious on its own, a simple dusting of powdered sugar or a swirl of whipped cream will put it over the top!
If you want to throw some extra chocolate in the mix, try adding chocolate chips, a drizzle of homemade fudge sauce, or even more chopped Reese’s cups.
A spoonful of Nutella or Biscoff spread on top would be tasty too!
Peanut Butter Cake in a Mug Recipe FAQ
Sure! Prepare as many mugs as you need, but I would suggest only microwaving two at a time for best results.
Keep in mind that the overall cooking time will probably be longer if you’re cooking two at once.
When you press lightly on the top, the texture should be tender but firm. If it makes a deep dent, it needs more time.
Mug cakes are designed to be eaten right away, and this peanut butter cake in a mug is no different!
There isn’t really a good way to save leftovers either since the cake can’t easily be removed. And your Reeses mug cake will just become tough and dry if you try reheating it later.
Enjoy!
With love, from our simple kitchen to yours.
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Peanut Butter Cake in a Mug
Ingredients
- 3 Nutter Butter cookies
- 3 tablespoons milk
- 1 teaspoon granulated sugar
- 1/4 teaspoon baking powder
- powdered sugar, for topping
- 1 Reese’s cup, chopped
Instructions
- In a food processor, crush nutter butter cookies until fine crumbs form.
- Add the crumbs, sugar, and baking powder to a 6-8oz. microwave safe mug, and stir.
- Add the milk and mix to combine.
- Microwave for 1 minute, adding 10 seconds more if needed.
- Remove from the microwave and let cool for 2-3 minutes before serving.
- Dust with powdered sugar and top with a chopped Reeses’s cup.
Donna’s Notes
Nutrition
All nutritional information is based on third party calculations and is only an estimate. Each recipe’s nutritional value will vary depending on the ingredients used, measuring methods, and portion sizes.
Originally published April 2021, updated and republished August 2024
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This was a nice quick dessert for the evening. Very moist and tasty!