2 Ingredient Peanut Butter Fudge (Easy Microwave Fudge)

This 2 ingredient peanut butter fudge is one of the easiest fudge recipes you’ll ever make and honestly one of the best. All you need is peanut butter and frosting to get ridiculously smooth, creamy, melt-in-your-mouth fudge with rich peanut butter flavor—no thermometer, no boiling, no candy stages to stress about. It comes together in minutes, sets up beautifully, and is perfect for holidays, potlucks, or last-minute sweet cravings. I use the same foolproof method as my 2 Ingredient Chocolate Fudge recipe, just with a peanut butter twist, and this version absolutely lives up to the hype.

Why You'll Love This Peanut  Butter Fudge Recipe

Ingredients You'll Need

• 8 oz. Creamy Peanut Butter 
• 8 oz. Vanilla Frosting

How To Make Peanut Butter Fudge

Step 1: Combine The Ingredients

First, add the jar of creamy peanut butter and vanilla frosting to a microwave-safe bowl. Microwave the peanut butter and frosting in two, 1-minute intervals. Stir constantly between each interval until the peanut butter and frosting are thoroughly combined.

Step 2: Pour The Mixture into a Pan

Next, line a loaf pan or square pan with parchment paper. Any size actually works really great; it will just change the thickness of the fudge. But if you don't know what to use, a 9x9 or 8x8 works really well. Transfer the peanut butter fudge mixture to the prepared pan and smooth out the top of it with a rubber spatula or the back of a spoon. 

Step 3: Chill The Fudge

Once the fudge is in the pan, transfer it to the fridge and let it chill for about an hour, or until it sets. 

Step 4: Slice & Serve

When an hour is up, or the peanut butter fudge has fully set, you can let it thaw for a few minutes at room temperature. Slice it into about 8 squares, serve, and enjoy!

Variations You Can Try

One of the best things about this 2 ingredient peanut butter fudge is how easy it is to customize. You can use the same simple base and change the mix-ins or toppings to make it feel totally different every time—perfect if you want a whole fudge platter without making five separate recipes.

Here are some fun ways to switch it up:

• Extra Creamy Peanut Butter Fudge: Swap the frosting for sweetened condensed milk for an extra-creamy finish. You'll need to microwave it in shorter intervals, stirring between each to keep it smooth.
• Peanut Butter Explosion Fudge: Press chopped Reese’s Cups, Reese’s Pieces, and peanut butter chips over the top of the warm fudge before refrigerating. It tastes like a loaded peanut butter candy bar in fudge form. Check out the version of this I made on TikTok.
• Peanut Butter Chocolate Chip Fudge: Sprinkle milk, dark, or mini chocolate chips on top right after you pour the fudge into the pan. They’ll lightly melt into the top layer and give you that classic peanut butter + chocolate combo.
• Marshmallow Swirl Peanut Butter Fudge: After you pour the fudge mixture into the pan, add spoonfuls of marshmallow cream or fluff on top. Use a toothpick or knife to gently swirl it through the surface for a pretty marbled look and pockets of marshmallow in every bite.
• Peanut Butter Cheesecake Fudge: For a tangier, cheesecake-style flavor, swap half of the vanilla frosting for cream cheese frosting (or mix softened cream cheese into the frosting first). You’ll get a slightly richer, more tangy fudge that tastes like peanut butter cheesecake squares.
• Oreo Peanut Butter Fudge: Fold in crushed Oreo cookies before spreading the fudge into the pan, or sprinkle them on top and press lightly so they stick. The combo of creamy peanut butter and crunchy chocolate cookies is always a hit.

Expert Tips To Make The  Best Peanut Butter Fudge

• Use the right peanut butter for the texture you want: For classic, smooth fudge, use creamy peanut butter (regular shelf-stable, not natural). Natural peanut butter that separates can make the fudge oily or cause it to set inconsistently. If you do want to use natural peanut butter, stir it extremely well and know the fudge may be softer and a bit more finicky.
• Pick your frosting wisely: Most 2 ingredient peanut butter fudge recipes use vanilla frosting or cream cheese frosting from a can. Vanilla gives you a sweeter, more candy-like fudge, while cream cheese frosting adds a subtle tang that tastes like peanut butter cheesecake. Either works—just use a standard 16-ounce can and stick with a brand you already like, because the frosting flavor definitely comes through.
• Melt low and slow in the microwave: When you combine the frosting and peanut butter, microwave in short bursts (20–30 seconds at a time) and stir between each. You want everything melted and smooth, but not so hot that the fats separate. Overheating is one of the main reasons fudge turns greasy or grainy. The mixture should be warm and pourable, not sizzling.
• Stir until completely smooth: Don’t rush the stirring step. After heating, use a spatula to stir the peanut butter and frosting together until the mixture is shiny and completely uniform, with no streaks or lumps. This helps the fudge set with a consistent, creamy texture from edge to center.
• Line your pan properly for easy removal: Line your pan (8x8 or similar) with parchment paper or foil, leaving overhang on two sides. This makes it super easy to lift the entire slab of fudge out after it sets, so you can cut neat squares on a cutting board instead of digging it out of the pan. A light spritz of nonstick spray under the parchment can help it stay in place.
• Tap the pan to release air bubbles: Once you pour the fudge mixture into the lined pan, tap the pan gently on the counter a few times. This helps release any trapped air bubbles and levels the surface, especially important if you’re adding toppings like chips, nuts, or candies.
• Let it fully set before slicing: It’s tempting to cut into it right away, but for clean squares and the best texture, chill the fudge for at least 2–3 hours, or until it’s firm to the touch. Overnight is even better if you want very sharp edges. Cutting too early can cause smearing and uneven pieces.
• Use a sharp knife and wipe between cuts: For bakery-style squares, use a long, sharp knife and wipe the blade clean with a warm, damp cloth between cuts. This prevents buildup on the knife and keeps the edges of each piece smooth instead of ragged.
• Store it properly to keep it creamy: Keep the fudge in an airtight container with parchment or wax paper between layers so the pieces don’t stick together. You can store it at cool room temperature or in the fridge, depending on how firm you like it. If it’s been refrigerated, let it sit out for a few minutes before serving so the texture softens slightly.

2 Ingredient Peanut Butter Fudge FAQS

What are the two ingredients in this peanut butter fudge?

This 2 ingredient peanut butter fudge is made with peanut butter and store-bought frosting (usually vanilla or cream cheese frosting). That’s it. No powdered sugar, no butter, no evaporated milk, and no candy thermometer required.

Can I use natural peanut butter?

You can, but it’s a bit riskier. Natural peanut butter tends to be runnier and separates more easily, which can cause the fudge to be soft, oily, or not set properly. If you want the most reliable, creamy fudge, use a regular, shelf-stable creamy peanut butter (like Jif, Skippy, or a similar brand). If you do try natural, stir it very well and be prepared for a softer set.

Can I use crunchy peanut butter instead of creamy?

Yes. Crunchy peanut butter will give your fudge little bits of peanuts throughout, which adds texture. The base will still be smooth, but you’ll get a nice crunch in every bite. Just make sure it’s still a conventional crunchy peanut butter, not an ultra-runny natural kind.

What kind of frosting works best?

Most people use vanilla frosting for classic sweet peanut butter fudge, or cream cheese frosting if they want a peanut butter cheesecake vibe. You can also experiment with chocolate frosting for a chocolate-peanut butter fudge. Stick with a regular 16-ounce can of frosting and a brand you like, since the flavor is noticeable.

Does this fudge need to be refrigerated?

You can store it either at cool room temperature or in the refrigerator. At room temp, the fudge stays soft and creamy; in the fridge, it will be firmer and a bit more sliceable. If your house is warm or you want to keep it for longer, the fridge is a safer choice. Either way, use an airtight container.

How long does 2 ingredient peanut butter fudge last?

Properly stored, this peanut butter fudge will keep for about 1 week at room temperature or up to 2 weeks in the refrigerator. Make sure it’s in a sealed container, with parchment or wax paper between layers to prevent sticking.

Can I freeze peanut butter fudge?

Yes. Peanut butter fudge freezes very well. Cut it into squares, place them in a single layer on a baking sheet to firm up, then transfer to a freezer-safe bag or container with parchment between layers. Freeze for up to 2–3 months. Thaw in the fridge or at room temperature until soft enough to bite.

Why didn’t my fudge set properly?

If your fudge is too soft or doesn’t set, common culprits include: using natural peanut butter, using less frosting than called for, or not chilling it long enough. Make sure you used the full amount of frosting, a standard creamy peanut butter, and give it plenty of time in the fridge. If it’s still too soft, you can sometimes salvage it by chilling longer or freezing and eating it more like a frozen treat.

Why does my fudge look oily or grainy?

This usually happens when the mixture is overheated. If the peanut butter and frosting get too hot, the fats can separate and cause greasiness or a slightly gritty texture. Next time, microwave in shorter bursts, stir frequently, and stop heating as soon as everything is smooth and combined.

Can I double the recipe?

Yes, this recipe doubles easily. Use two cans of frosting and twice the peanut butter, and pour it into a larger pan (such as a 9x13) or two 8x8 pans. Just make sure you have a big enough bowl to mix everything thoroughly, and adjust your chill time a bit if the fudge layer is thicker.

Is this fudge good for gifting or holiday cookie trays?

Definitely. This 2 ingredient peanut butter fudge is perfect for holiday platters and homemade gift boxes because it slices cleanly, travels well, and tastes like classic old-fashioned fudge without all the effort. Place squares in mini paper liners or layer them in tins with wax paper between layers for a polished look.

Wrapping Things Up

Well, that's how to make peanut butter fudge with 2 ingredients! This is hands down one of the best fudge recipes you'll ever try - and that's especially true if you love peanut butter.

Whether it be for the holiday season, or when you just want to satisfy that sweet tooth craving, this is the recipe for you. And it's just the perfect no-bake dessert that is sure to please adults and kids alike!

As always, if you give this fudge recipe a try, leave a comment below and let us know how it went. Oh, and for more recipes, check out our Instagram, TikTok, and YouTube. We post new ones on them almost every single day.

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