Kirbie's Cravings

5 Minute Microwave Peanut Butter Fudge

This easy fudge is just 3 ingredients and takes about five minutes to prepare. Everything is made in one bowl and cooks in the microwave. close-up photo of microwave peanut butter fudge pieces

I had a lot of fun making cookies and cream fudge and Nutella fudge. So I decided to tackle peanut butter fudge.

Before I had a chance to experiment, I came across a super easy recipe by Alton Brown. The recipe was only four ingredients and doesn’t use chocolate unlike most of the other fudges I’ve made.

close-up photo of a stack of microwave peanut butter fudge pieces

I opted to leave out the vanilla, making this recipe just 3 ingredients. This recipe takes only five minutes to put together. Super easy! They store well too making it great for holiday gifting.
close-up photo of microwave peanut butter fudge

Other easy fudge recipes:

Keto Peanut Butter Fudge

Nutella fudge

Peppermint Fudge

Peanut Butter Fudge

Andes Mint Fudge

Microwave Peanut Butter Fudge

Servings: 64 pieces
Prep Time: 3 minutes
Cook Time: 2 minutes
Total Time: 5 minutes
Course: Dessert
Cuisine: American
This peanut butter fudge takes only five minutes to put together. Super easy! They store well too making it great for holiday gifting.
5 from 6 votes


  • 8 oz unsalted butter
  • 1 cup creamy peanut butter (see note)
  • 1 lb powdered sugar


  • Line an 8 x 8 inch pan with parchment paper (I recommend making the parchment paper long enough so that it hangs off the edges of the pan on two sides, which will allow you to grip them later to lift out the parchment paper and contents.) 
  • Combine the butter and peanut butter in a microwave-safe bowl. Microwave for 1 minute and stir. Microwave for 1 more minute and stir again until mixture is completely melted and smooth. Add the powdered sugar to the peanut butter mixture and stir until batter is smooth. The batter should be quite thick, like a paste.
  • Spread batter into the lined baking pan. Press another parchment paper on the surface and use your palms to apply gentle pressure to evenly spread the fudge across the entire pan. Lift off the top layer of parchment paper and smooth surface of fudge with your hands. Refrigerate for about 2 hours to let set. Lift fudge out of the pan. Cut into one-inch squares with sharp knife. Keep uneaten portions stored in the fridge.



Avoid using natural peanut butter as the consistency can vary and affect the texture of the fudge.
Recipe very slightly adapted from: Alton Brown

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!

Related Recipes

5 Minute Cookies and Cream Fudge

Nutella Fudge

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99 comments on “5 Minute Microwave Peanut Butter Fudge”

  1. How do you get 64 pieces out of a 8X8 pan??

    • The instructions specifically state that they are cut into 1-inch squares. Fudge is extremely rich and usually served in small candy portions. An 8 inch by 8 inch pan produces 64 one-inch squares.

  2. I’m so physed I finally found this 4 ingredient #1 favorite 5 min. Microwave only recipe I lost 20 years ago!!! I always added the vanilla as I have again. So fast,creamy,and was always a Family favorite!! My Grandchildren will love it…just as my adult Sons always did!!! P.s.

  3. How can u use regul

    ar sugar

    • For the best result, you should use powdered sugar (confectioners’ sugar). It is needed to firm up the fudge. If you only have regular sugar, you can turn it into powdered sugar if you have a high powered blender

  4. Mine turned out watery and I didn’t want to add more sugar.  Sure hope it’s sets well

  5. I used 16tbs of peanut butter and 16 tbsp of butter, but it was very liquid and never hardened up. Are my measurements off?

    • How much powdered sugar did you use? You may not have used enough. The powdered sugar is what turns the fudge solid.

  6. Can you use salted butter ?

  7. Do you think i could use this fudge spread thinly as a filling for sugar cookie or peanut butter sandwich cookies? It seems like it might be something different from just frosting.

  8. Very good and easy and quick to make.

  9. I love this fudge! It is so quick and easy to make and comes out perfect every time. It is a Christmas tradition.

  10. Good taste but even after setting up in fridge for several hours when I cut it one piece in each row crumbled. Not sure if there was a pocket or what but super easy and good!

  11. Yes I made the PNB fudge.sooo good.i used margarine bcuz that’s all I turned out. Perfect.i also added a teaspoon of vanilla.thank you.

  12. I made this last night with my 9 yr old son and,!!! Is it EVER AMAZING!! Thank you SO very much for this info! I’m always in the kitchen baking and, cooking from scratch and, as anyone knows, that takes much more time and effort than box foods!! So this is an absolute delight to have in my arsenal ? I’m posting pictures as soon as I’m able to figure it out … You’re absolutely a life saver!!

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