Home Desserts Microwave Peanut Butter Fudge (Just 3 Ingredients)

Microwave Peanut Butter Fudge (Just 3 Ingredients)

This microwave peanut butter fudge is rich, creamy, and delicious!

It calls for just three ingredients and it’s ready in 5 minutes. Perfect for your next family get-together..

Microwave Peanut Butter Fudge
Enter your email below & we'll send it straight to your inbox.

Creamy peanut butter, powdered sugar, and unsalted butter are all you need for this classic dessert.

Best of all, it’s no-bake. Just microwave and mix.

Peanut butter fudge is perfect for holiday gifts, family gatherings, or a sweet midnight snack!

How to Make Microwave Peanut Butter Fudge

Forget the hot stove and the candy thermometers. Thanks to the microwave, making this peanut butter fudge is a breeze.

Just follow these basic steps:

1. Microwave the peanut butter and butter. In a microwaveable bowl, mix peanut butter and butter. Microwave for 1 minute. Stir the mixture and microwave for another minute. Stir until fully incorporated. 

2. Add powdered sugar. Mix the powdered sugar into the peanut butter mixture until smooth. It should be a thick, paste-like batter.

3. Transfer the batter. Pour the batter into a baking pan lined with parchment paper. Next, place a sheet of parchment paper on top of the fudge. Start pressing with your palms to spread evenly across the pan. 

4. Chill and cut. Refrigerate for at least 2 hours. Remove the fudge from the pan and cut into small squares using a sharp knife. Enjoy!

Should Peanut Butter Fudge Be Refrigerated?

Once your family takes a bite of this peanut butter fudge, it’s unlikely there will be any leftovers. In fact, I recommend making extra to enjoy later. 

There’s no need to refrigerate, unless you like your fudge cold. Store your fudge in an air-tight container and it will stay fresh for 3 to 5 days.

If you refrigerate your fudge, it will last for up to a month and up to 1 year in the freezer.

Stack of Salted Peanut Butter Fudge

How Long Does Fudge Last?

The shelf-life of fudge depends on how you store it. At room temperature, fudge will last for two weeks. If you refrigerate it, it’s good for a month. If you freeze it, it can survive for an entire year!

Enter your email below & we'll send it straight to your inbox.

Just don’t place it inside the freezer door. Store your fudge at the back to shield it from shifts in temperature whenever someone opens the freezer.

But, before eating stored fudge, it’s also wise to check for signs of spoilage. When you start to see cracks on your fudge, that means it’s been exposed to too much air. This makes your fudge dry and less tasty.

Likewise, when your fudge becomes way too soft and mushy, it means it’s time to let it go. Also, if the fudge has become tough and has an oily surface, it’s also past its prime.

How To Store Microwave Peanut Butter Fudge

There are 3 main ways to store fudge: at room temperature, in the fridge, or in the freezer.

Here are some quick guidelines to follow: 

To Store: For room temperature, place the fudge in a plastic container or a self-sealing bag. Keep it in a cool, dark area and enjoy within 2 weeks. For the refrigerator, place the fudge in an air-tight container to avoid drying out. Enjoy within 1 month.

To Freeze: Double-wrap the squares individually. Do this by wrapping them with wax paper, then wrap with plastic wrap or foil. Next, place the squares into an air-tight container or a freezer bag. To thaw, simply place in the fridge or on the counter for a few hours. Enjoy within 3 months for the best flavor.

Peanut Butter Fuge on a Small Saucer

Tips For the Best Fudge

Unlike other candies, making this three-ingredient microwave fudge recipe is super easy. After all, there’s zero baking!

That said, I have some tips to make sure your fudge is the best.

  • Add peanuts for crunch. This recipe yields a smooth fudge. If you prefer a little crunch, add peanuts to the batter. Yum!
  • Score your squares. Want perfectly cubed fudge? Make score lines on the fudge to ensure even squares when cutting. I like to use dental floss to score my fudge – the unflavored kind, of course! A kitchen ruler helps too.
  • Cut smaller for gifts. When I pass this fudge out as gifts I cut it into 1 inch squares. The smaller the size, the more squares you get!
  • Heat your knife. Before cutting, heat your knife under hot water and dry with a towel. It makes cutting the fudge much easier.
  • Firm up your fudge. If your fudge becomes too moist, just unwrap it. Fudge naturally starts to dry when exposed to air. Leave it unwrapped for a few hours and it will become much firmer.

Microwave Peanut Butter Fudge



Prep time


Cooking time





With just 3 ingredients, this microwave peanut butter fudge is ready in just 5 minutes! Rich, creamy, and completely irresistible.


  • 8 oz unsalted butter

  • 1 cup creamy peanut butter

  • 1 pound powdered sugar


  • Line an 8×8 inch pan with parchment paper. Use enough so that the paper hangs over the side. This makes it much easier to remove the fudge from the pan.
  • In a microwave-safe bowl, combine butter and peanut butter. Microwave for 1 minute and stir. Microwave for another minute and stir well until the mixture is completely smooth and incorporated.
  • Add the powdered sugar and stir until smooth. Use a wooden spoon and stir vigorously until it looks like a thick, paste-like batter. Work quickly so it doesn’t set.
  • Spread the batter onto the lined baking pan. Place a sheet of parchment paper on top of the fudge and start pressing with your palms to spread evenly across the pan.
  • Refrigerate for at least 2 hours. Remove the fudge from the pan and cut into small, 1-inch squares using a sharp knife.
  • Enjoy!

Want More Fudge Recipes?

Eagle Brand Fudge
Fantasy Fudge
Nestle Fudge Recipe
Rocky Road Fudge

Peanut Butter Fudge with just 3 ingredients

Did you like the recipe?

Click on a star to rate it!

Average rating 4.7 / 5. Vote count: 86

No votes so far! Be the first to rate this post.


Share on social media:

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?

author avatar
Kim - InsanelyGood
Hey there! I'm Kim. I love running, cooking, and curling up with a good book! I share recipes for people who LOVE good food, but want to keep things simple :)

3 thoughts on “Microwave Peanut Butter Fudge (Just 3 Ingredients)”

Leave a Comment