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My Peanut Butter Fudge recipe is pure old-fashioned candy counter joy without the candy thermometer, stovetop babysitting, or carnival lines. Just four pantry ingredients, a few minutes in the microwave, and you’ve got a pan of ultra-creamy, smooth, slice-and-share peanut butter fudge that tastes like it came from a sweet shop.
If you’re building a holiday candy tray, this is a perfect match with my Crockpot Candy, Bourbon Balls, Easy Fudge Recipe, and White Trash for a fun mix of flavors and textures.
So grab your favorite jar of peanut butter and let’s make a pan of nostalgia you can whip up anytime the craving hits.
✨ Before You Begin
✨ Use the right peanut butter. For best results, use a regular, shelf-stable smooth peanut butter (Jif, Skippy, etc.), not natural or “stir” peanut butter. Natural peanut butter can separate and make the fudge oily or crumbly.
✨ Prep the pan first. Line your 8×8-inch pan with foil and give it a light spray of nonstick cooking spray before you start. Once the fudge is mixed, it begins to firm up quickly, so you’ll want that pan ready to go.
✨ Have everything measured. The fudge comes together fast, and you’ll be stirring vigorously at the end. Measure out your vanilla and powdered sugar before you start microwaving so you can move quickly.
Peanut Butter Fudge Ingredients + Key Notes
This is just a quick glance at what you’ll need. For exact measurements and the full ingredient list, head down to the recipe card below.
Butter: I like regular salted butter here — that little bit of salt makes the peanut butter flavor pop and keeps the fudge from tasting flat. Since there’s no milk or cream in this recipe, you can substitute margarine or a good quality vegan butter if you need a dairy-free version.
Smooth peanut butter: Stick with creamy, no-stir peanut butter from a jar. It melts smoothly with the butter and sets up beautifully once you add the powdered sugar. Avoid natural peanut butters that separate (oil on top); they just don’t behave the same in fudge and can leave you with a greasy texture.
Vanilla: A small amount of pure vanilla extract softens the sweetness and adds that classic candy-shop aroma. It’s doing more than flavoring here — vanilla actually rounds out the overall flavor so the fudge doesn’t taste one-note.
Powdered sugar: A full pound of powdered sugar (confectioners’ sugar) is what turns melted butter and peanut butter into thick, sliceable fudge. The superfine texture dissolves easily and helps create that ultra-smooth, creamy bite. If your sugar is lumpy, sift it first so you don’t end up with little sugar pockets in the finished fudge.
How to Make Peanut Butter Fudge
Prep the pan.
Line an 8×8-inch pan with aluminum foil, letting the foil overhang the sides by about 2 inches so you can lift the fudge out later. Lightly coat the foil with nonstick cooking spray and set the pan aside.
Microwave the peanut butter mixture.
Add the butter pieces and smooth peanut butter to a large microwave-safe bowl. Cover the bowl tightly with plastic wrap and poke a few holes in the top to vent steam. Microwave on HIGH for 2 minutes. Carefully peel back the plastic (watch the hot steam!) and stir until the mixture is mostly smooth. Recover the bowl and microwave for another 2 minutes. Stir again until completely smooth and combined.
Finish the fudge.
Working quickly, add the vanilla to the hot butter–peanut butter mixture, then dump in the powdered sugar. Stir, stir, stir until everything is fully combined and the mixture looks thick, matte, and loses its shine. Don’t overbeat; as soon as it’s smooth and dull, you’re done.
Spread and chill.
Scrape the fudge into your prepared pan and use a rubber spatula to press it into an even layer, smoothing the top. Cover the pan with plastic wrap and refrigerate until fully set, about 2 hours.
Slice and serve.
Lift the fudge out of the pan using the foil overhang. Let it sit at room temperature for about 10–15 minutes (it cuts more cleanly when it’s not ice cold), then cut into 1-inch squares and enjoy.
Recipe Notes for Peanut Butter Fudge
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Pan size: An 8×8 pan gives you nice, thick pieces. You can use a 9×9 if that’s what you have, but the fudge will be a little thinner and may set up slightly faster.
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Texture: The fudge should be smooth, creamy, and sliceable — not dry or crumbly. If it seems too stiff while you’re stirring in the powdered sugar, keep going a bit more; as long as it’s still warm, it will usually smooth out.
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Low-carb option: This version is very much a classic powdered-sugar fudge. If you’re looking for a low-carb or keto option, you’ll want a completely different recipe that’s been developed around low-carb sweeteners rather than trying to swap them in here.
Storing + Freezing + Make-Ahead
Storing
- Peanut butter fudge keeps beautifully, which makes it perfect for gifting and entertaining. Store slices in an airtight container with parchment or wax paper between layers to keep them from sticking. You can keep it:
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At cool room temperature for 3–4 days
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In the refrigerator for up to 2 weeks
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Freezing
- Freeze fudge in a freezer-safe container (again, with parchment between layers) for up to 2–3 months. Thaw overnight in the refrigerator, then let it sit at room temperature for 15–20 minutes before serving so the texture comes back to its creamiest self.
Make-ahead
- Since this fudge stays fresh for days, you can easily make it several days before a party or holiday cookie swap. Just keep it tightly covered so it doesn’t absorb fridge or freezer odors.
Food Safety
- If you’d like more info on food safety, check out this link.
⭐ Pro Tips for the Best Peanut Butter Fudge
⭐ Don’t skip venting the plastic wrap. Those little holes in the plastic help release steam so the mixture heats evenly without bubbling over or creating hot spots.
⭐ Work while the mixture is hot. Once the butter and peanut butter are microwaved, move quickly when adding the vanilla and powdered sugar. The warmer the mixture is, the more smoothly the sugar will blend in.
⭐ Mix until just dull, then stop. Overbeating as the mixture cools can make the fudge firm up too quickly and turn dry or crumbly. As soon as it looks thick and matte (no shiny spots), spread it into the pan.
⭐ Let it warm up a bit before slicing. Cutting ice-cold fudge straight from the fridge can cause crumbling and uneven squares. That 10–15 minutes at room temperature makes a big difference in getting clean, pretty cuts.
✦ Peanut Butter Fudge Frequently Asked Questions
✦ Does peanut butter fudge need to be refrigerated?
You don’t have to refrigerate peanut butter fudge if your kitchen stays cool; it will be fine at room temperature for a few days. That said, I like to store it in an airtight container in the fridge so it stays firm, then bring it out 10–15 minutes before serving so it softens just slightly. If your house runs warm, the refrigerator is definitely the safer choice.
✦ Can I use crunchy or natural peanut butter in this recipe?
You can use crunchy peanut butter if you’d like little bits of peanut in your fudge — just make sure it’s a regular, no-stir brand. I don’t recommend natural peanut butter (the kind with oil floating on top) because it tends to separate and can make the fudge greasy or cause it not to set properly.
✦ What should I do if my peanut butter fudge turns out oily?
Oily fudge usually means there was too much separated oil in the peanut butter or the mixture got overheated. You can gently blot the surface with a paper towel before it fully sets to remove excess oil. Next time, be sure to use a classic, no-stir peanut butter and avoid overheating in the microwave — two 2-minute bursts are usually plenty.
✦ Why is my fudge dry or crumbly instead of creamy?
If the fudge mixture cools too much before the powdered sugar is fully incorporated, or if you beat it for too long, it can become dry and crumbly. Aim to mix the sugar in while the mixture is still quite warm and stop as soon as everything is smooth and matte, not shiny. Also double-check that you’re measuring the powdered sugar accurately; packing it too tightly can mean you’re adding more than the recipe calls for.
✦ Can I make this without a microwave?
Yes! Melt the butter and peanut butter together in a heavy saucepan over low heat, stirring constantly until completely smooth and warm but not boiling. Remove from the heat, stir in the vanilla, then add the powdered sugar and continue with the recipe as written. Low and slow is key so the mixture doesn’t scorch.
Still have questions? Drop them in the comments — I love helping you bake + cook with confidence! 💗
More Easy Fudge + Candy Recipes You’ll Love
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Bourbon Toffee – Buttery, crisp toffee with a hint of bourbon and a rich chocolate layer that absolutely melts in your mouth.
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Dubai Bar – Decadent layered bars with a gooey, nutty, chocolatey center and a tender crust — they always disappear first on dessert trays.
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Brownie Bark – Ultra-thin, shatteringly crisp brownie pieces loaded with chocolate flavor for all the “corner piece” lovers.
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3 Ingredient Fudge –Silky, rich, and unbelievably easy, this old-fashioned fudge comes together with just three pantry staples for a creamy, chocolatey treat that’s perfect for last-minute gifts or holiday trays.
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Christmas Tree Brownies – Festive, frosted brownies cut into little trees and decorated with sprinkles for the cutest holiday dessert.
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Chocolate Snowball Cookies – Tender, chocolatey bite-size cookies rolled in powdered sugar that look just like little snowballs.
- Pumpkin Pie Fudge – All the cozy flavors of pumpkin pie tucked into creamy, spiced fudge squares for fall and holiday parties.
Tried This Recipe?
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Thanks for stopping by my kitchen today — happy cooking, friends! 💗 Kathleen
Peanut Butter Fudge
Ingredients
- 8 ounces (2 sticks) butter, cut into 1-inch pieces
- 1 cups smooth peanut butter
- 1 teaspoon vanilla
- 1 pound powdered sugar
Instructions
- Line an 8X8 inch pan with aluminum foil, overlapping the edges of the pan 2 inches. (This will make for easy removal and clean up). Spray nonstick cooking spray on the foil. Set aside.
- Add the butter (8 ounces) and peanut butter (1 cup) to a large microwave-safe bowl, and cover with plastic wrap. Poke holes in the plastic to vent steam. Microwave on high for 2 minutes. Carefully pull back plastic and stir to combine. Recover with plastic and microwave for an additional 2 minutes.
- Add the vanilla (1 teaspoon) and powdered sugar (1 pound) to a bowl and stir to combine, until the mixture becomes dull and loses its shine. Don't overbeat. Spread in prepared pan, use a rubber spatula to even out the top of the mixture. Cover with plastic wrap and refrigerate until set. About 2 hours. Cuts best when it's been out of the fridge 10-15 minutes.
Notes
- Looking for a low carb peanut butter fudge recipe? The Little Pine has one!
- Don’t skip venting the plastic wrap. Those little holes in the plastic help release steam so the mixture heats evenly without bubbling over or creating hot spots.
- Work while the mixture is hot. Once the butter and peanut butter are microwaved, move quickly when adding the vanilla and powdered sugar. The warmer the mixture is, the more smoothly the sugar will blend in.
- Mix until just dull, then stop. Overbeating as the mixture cools can make the fudge firm up too quickly and turn dry or crumbly. As soon as it looks thick and matte (no shiny spots), spread it into the pan.
- Let it warm up a bit before slicing. Cutting ice-cold fudge straight from the fridge can cause crumbling and uneven squares. That 10–15 minutes at room temperature makes a big difference in getting clean, pretty cuts.
Nutrition
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