You are here: Home » Recipes » Three-Ingredient Peanut Butter Fudge Three-Ingredient Peanut Butter Fudge Recipe by MnMs Yield 36 pieces PrintEmail Ingredients 2 (16- to 18-ounce) jars Skippy peanut butter1 large Marshmallow Fluff4 cups granulated sugar1 cup water Instructions Open peanut butter (be sure to remove all of the foil seal) place in microwave for up to 2 minutes. Remove and pour into large bowl. Place marshmallow in microwave for 45 seconds. Add to peanut butter in large bowl. Grease (with butter or margarine) a 13 x 9 baking pan. Combine water and sugar in medium sauce pan. Place pan on heat. Heat until it comes to a rolling boil. Once it reaches a rolling boil – time for 3 minutes. DO NOT SCRAPE OR STIR AT ANY TIME. Remove from heat and pour over peanut butter and marshmallow. Mix well and pour into 13 x 9 pan and let set.