I love how effortless this microwave peanut butter fudge is to make. It’s rich, creamy, and loaded with sweet peanut butter flavor. I can whip it up in just minutes with ingredients I usually have in my pantry. It’s the perfect no-bake treat for holidays, parties, or anytime I crave something indulgent.

Why I’ll Love This Recipe

I enjoy this recipe because it’s a fast and foolproof way to satisfy my sweet tooth. I don’t need a candy thermometer or any stovetop cooking. I just melt, mix, chill, and slice. The result is a smooth and velvety fudge that’s sweet, nutty, and completely addictive. Plus, I can dress it up with holiday candy or keep it simple for everyday snacking.

Ingredients

(Here’s a tip: Check out the full list of ingredients and measurements in the recipe card below.)

unsalted butter
creamy peanut butter
vanilla extract
powdered sugar
water (for pan prep)
optional red and green M&M’s for garnish

Directions

I start by lining an 8×8-inch baking pan with parchment paper. I add a tablespoon of water under the parchment to help it stay in place.
In a microwave-safe bowl, I combine the butter and peanut butter. I microwave the mixture for 60 seconds, then stir until smooth.
I stir in the vanilla extract.
I sift in the powdered sugar one cup at a time, stirring well after each addition until the mixture is smooth and lump-free.
I pour the fudge mixture into the prepared pan and spread it evenly with a spatula.
I place a second sheet of parchment paper on top to smooth the surface, then refrigerate it for about 2 hours until fully set.
Once chilled, I remove the top parchment, lightly score the surface for slicing, and then lift the fudge out of the pan using the parchment overhang.
I slice the fudge into squares using a sharp knife warmed under hot water.
If I want to make it festive, I press a few M&M’s into the top of each square.

Servings and Timing

Prep time: 10 minutes
Chilling time: 2 hours
Total time: 2 hours 10 minutes
Servings: about 64 small squares

Variations

I like how customizable this fudge is. Here are a few ways I switch things up:

I use different brands of peanut butter to subtly change the flavor and color. JIF gives me a light and creamy fudge, while Reese’s adds a deeper, slightly orange tone.
If I’m out of vanilla, I replace it with maple syrup for a cozy twist.
I sometimes sprinkle mini chocolate chips or chopped peanuts on top instead of M&M’s.
If I don’t have powdered sugar, I’ve used granulated sugar in a pinch (though the texture is slightly grainier).

Storage/Reheating

I store the fudge in an airtight container:

In the fridge: it lasts for up to 1 week. I separate layers with wax paper so the pieces don’t stick.
At room temperature: it keeps for 2 to 3 days in a cool, dry place.
In the freezer: I wrap each square in foil or plastic wrap, then store them in a freezer bag for up to 3 months. I let the fudge thaw in the fridge or at room temp before serving.

FAQs

How long should the fudge chill before cutting?

I chill the fudge for 2 hours so it firms up enough to cut cleanly.

Can I use natural peanut butter?

I avoid natural peanut butter because the oil separation can make the fudge greasy and cause it to set poorly.

How do I cut the fudge without it crumbling?

I warm my knife under hot water, wipe it dry, and then slice. This gives me smooth, clean edges.

Do I need to sift the powdered sugar?

I always sift the powdered sugar—it prevents lumps and gives the fudge a super smooth texture.

Will different brands of peanut butter change the result?

Yes, I’ve noticed different brands give slightly different colors and flavors. Some are sweeter, some saltier, but they all work well as long as they’re creamy.

Conclusion

This microwave peanut butter fudge is a go-to recipe I keep coming back to. It’s rich, creamy, and incredibly easy to make. Whether I’m whipping it up for a holiday tray or a last-minute treat, I know it’ll be a hit. With just a few pantry staples and no cooking required, it’s one of the simplest sweets I can make—and one of the most delicious.