Go Back
+ servings

Peanut Butter Fudge (Microwave)

close up shot of a pile of Peanut Butter Fudge topped with m&m's on a plate
Rich and creamy, this peanut butter fudge is irresistible, and it takes only a handful of ingredients and a few minutes to make this classic treat!
Prep Time 10 mins
Chill Time 2 hrs
Total Time 2 hrs 10 mins
Course Dessert
Cuisine American
Servings 64
Calories 85 kcal


  • 1 cup unsalted butter
  • cups creamy peanut butter
  • 2 teaspoons vanilla extract
  • cups powdered sugar
  • 1 tablespoon water
  • red and green M&M's, optional garnish


  • Cut out two pieces of parchment paper. One should be big enough to line an 8x8 baking dish with enough overhang to lift the fudge out of the dish. The other should be just the right size to sit on top of the fudge.
  • Add a tablespoon of water to the bottom of the baking dish and line the pan with the larger piece of parchment paper.
  • In a medium-sized microwave-safe bowl, add the unsalted butter and the creamy peanut butter. Heat in the microwave for 60 seconds and then stir. Add the vanilla extract and stir again.
  • Slowly add the powdered sugar, one cup at a time, whilst stirring. Continue to stir until completely combined with no lumps or white streaks.
  • Pour the fudge mixture into the baking dish and spread it out evenly with a spatula.
  • Place the smaller piece of parchment paper on top of the fudge to help smooth the top. Leave it in place and put the fudge in the refrigerator to chill for two hours.
  • Remove the fudge from the refrigerator. Remove the top piece of parchment paper. Using a sharp kitchen knife, pre-score the size and number of the serving pieces of fudge, but do not cut the fudge until you remove it from the pan. 
  • Using the over-hang pieces of paper, lift out the fudge, and place it on a cutting board.
  • Warm a large, sharp knife under hot water. Dry it and slice the fudge.
  • Once the pieces are cut, place 2 to 3 red and green M&M’s on the top of the fudge for decoration.


  • Any commercial brand of peanut butter will work for this recipe, although you may find that the brand you choose will affect the color of your fudge slightly. We tested four different brands (JIF, Peter Pan, Skippy, and Reese's) and found that Peter Pan produced a darker color, JIF was the lightest, and Reese's had a slight orange hue, but the fudge consistency was the same. The Peter Pan brand was also slightly sweeter, while the JIF was just a bit saltier. Overall, any brand will give you delicious fudge!
  • Sifting the powdered sugar before mixing it in will help ensure that you have a very smooth fudge.


Calories: 85kcalCarbohydrates: 7gProtein: 2gFat: 6gSaturated Fat: 2gCholesterol: 8mgSodium: 28mgPotassium: 40mgFiber: 1gSugar: 7gVitamin A: 88IUCalcium: 3mgIron: 1mg