This microwave peanut butter fudge is the easiest fudge you will ever make. Four ingredients, five minutes of actual work, and the microwave does the heavy lifting. No candy thermometer, no stovetop, no stress.
The result is smooth, dense, and intensely peanut-buttery fudge that melts in your mouth. Cut it into squares and try not to eat the whole pan in one sitting.
It is perfect for holidays, potlucks, gift-giving, or just a random Tuesday when you need something sweet. One batch makes 24 pieces and they disappear fast.
Why You Will Love This Recipe
- Only 4 ingredients. Peanut butter, butter, powdered sugar, vanilla. That is the entire recipe.
- Microwave method. No stovetop, no candy thermometer. Just melt, stir, pour, and chill.
- Ready in 10 minutes plus chill time. The actual hands-on work is almost nothing.
- Foolproof. Unlike traditional fudge that requires precise temperatures, this version is virtually impossible to mess up.
Key Ingredients
- Creamy peanut butter (1 cup). Use a standard creamy peanut butter like Jif or Skippy. Natural peanut butter with oil separation will change the texture.
- Butter (1 cup / 2 sticks). Real butter, not margarine. It gives the fudge a rich, smooth texture and helps it set properly.
- Powdered sugar (1 pound). This is the structure of the fudge. Sift it first for the smoothest result. One pound is about 3.5 cups.
How to Make Microwave Peanut Butter Fudge
Melt the peanut butter and butter together in the microwave in 30-second intervals. Stir between each interval until smooth.
Stir in vanilla, then gradually add the powdered sugar one cup at a time. Mix until thick and smooth.
Pour into a lined 8×8 pan and spread evenly. Refrigerate for at least 1 hour until firm, then cut into 24 squares.
Tips for the Best Peanut Butter Fudge
- Sift the powdered sugar. Lumpy powdered sugar makes lumpy fudge. A quick sift gives you perfectly smooth results.
- Line the pan with parchment. Leave overhang on two sides so you can lift the whole block out for easy cutting.
- Cut with a sharp knife. Wipe the blade clean between cuts for the neatest squares. Let the fudge come to room temperature for 5 minutes before cutting.
Variations
- Chocolate swirl. Melt 1/2 cup chocolate chips and swirl it on top before chilling.
- Butterscotch fudge. Replace the peanut butter with butterscotch chips melted with the butter.
- Peanut butter cup fudge. Press chopped Reese’s cups into the top before refrigerating.
Storage
- Refrigerator. Store in an airtight container for up to 2 weeks.
- Freezer. Freeze in a single layer, then transfer to a freezer bag. Keeps for 3 months.
- Room temperature. The fudge softens at room temp. It is best stored cold and brought out 5 minutes before serving.
Frequently Asked Questions
Can I use natural peanut butter?
It is not recommended. Natural peanut butter has a looser consistency and the oil tends to separate, making the fudge greasy and soft. Stick with processed peanut butter for the best results.
Why is my fudge too soft?
You may not have added enough powdered sugar, or the fudge did not chill long enough. Add more sugar until the mixture is thick and stiff, and refrigerate for at least 1 hour.
Can I double this recipe?
Yes. Double all ingredients and use a 9×13-inch pan instead. The microwave time may be slightly longer for the larger amount of peanut butter and butter.
Microwave Peanut Butter Fudge
Ingredients
- 1 cup creamy peanut butter
- 1 cup butter 2 sticks
- 1 pound powdered sugar about 3.5 cups
- 1 teaspoon vanilla extract
Instructions
- Line an 8x8-inch pan with parchment paper, leaving overhang on two sides for easy removal.
- Combine the peanut butter and butter in a large microwave-safe bowl. Microwave in 30-second intervals, stirring between each, until melted and smooth (about 1.5 minutes total).
- Stir in the vanilla extract.
- Gradually stir in the powdered sugar, one cup at a time, until the mixture is thick and smooth.
- Pour into the prepared pan and spread into an even layer. Smooth the top with a spatula.
- Refrigerate for at least 1 hour until firm, then cut into squares.
Notes
Final Thoughts
This microwave peanut butter fudge is smooth, creamy, and ready in minutes. Four ingredients, a microwave, and a pan — that is all it takes. Make a batch for the holidays, wrap some up as gifts, or just keep a stash in the fridge for whenever the craving hits.
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