You can make this rich, creamy keto peanut butter fudge using only five ingredients that most people have on hand.
This keto peanut butter fudge recipe is perfect for sharing or freezing for a later date. Dairy-free option included.
If you love fudge you’ll also want to try my chocolate keto fudge recipe.

Keto Peanut Butter Fudge Recipe
If you love peanut butter and you love treats with peanut butter, you’re going to want to make this easy keto peanut butter fudge. This low carb peanut butter fudge recipe is super simple to make.
You can add chopped nuts, sugar-free chocolate chips or a little sea salt for a fun add-in option. You can also wrap individual pieces and give them away as gifts.
How to make keto peanut butter fudge:
- Add the peanut butter and butter to a medium mixing bowl. Cover the bowl and microwave for a minute at a time, until the butter is melted.
- Remove the bowl from the microwave and add the vanilla and salt. Stir until the mixture is well combined. Be careful, the bowl will be hot.
- Add the sugar-free powdered sugar and stir until completely combined.
- Transfer keto peanut butter fudge into your prepared pan and smooth the top.
- Cover and chill for at least 6 hours or overnight.
- To cut the peanut butter fudge, lift the parchment paper with the fudge out of the pan and place it on a cutting board before cutting into squares.
These numbered steps match the numbered photos above and are for illustration purposes only. Please see the printable recipe card below for the full set of instuctions.

How to make keto peanut butter fudge on a stove top:
In a medium sauce pan, melt sugar-free peanut butter and butter together over medium heat. Add in vanilla and salt and stir until combined.
Add in the sugar-free powdered sugar and stir until combined. Follow the remaining steps above for setting the fudge.
Can you freeze peanut butter fudge?
Yes, most fudge recipes freeze well, especially this keto peanut butter fudge recipe. You can freeze this peanut butter fudge in a sealed container for up to three months.
Can I use homemade peanut butter to make peanut butter fudge?
I don’t typically recommend homemade peanut butter when making keto peanut butter fudge as it tends to have more oil and be runnier, which makes it hard to set up properly.
If you have thick homemade peanut butter go ahead and give it a try, otherwise use store bought sugar-free peanut butter.

Dairy-free Keto Peanut Butter Fudge
Use dairy-free butter to make this keto peanut butter fudge dairy-free. We’ve used earth balance butter spread with success. I haven't tried coconut oil in this recipe, but when I do, I'll post about it here.
Sugar-Free Peanut Butter
Peanut butter is naturally a little sweet but most brands add sugar. You’ll want to look for a natural peanut butter that is either sugar-free or has no added sugar.
Sugar-free peanut butters sometimes add sugar alternatives. Look at labels and pick which one is best for you.
Love peanut butter? Try these keto peanut butter cookies next. You could also try a recipe for Ice Cream with Nuts. Just use a low sugar option.
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Keto Peanut Butter Fudge
You can make this rich, creamy keto peanut butter fudge using only five ingredients that most keto kitchens have on hand. This recipe is perfect for sharing.
Ingredients
- 1 cup creamy sugar-free peanut butter (no sugar added, or natural no sugar added)
- ½ cup (1 stick) butter (salted and unsalted work)
- 2 teaspoons gluten-free vanilla extract
- 1 cup powdered sugar-free sweetener (we use Swerve confectioners)
- ¼ teaspoon salt (omit if using salted butter or salted peanut butter)
Instructions
- Line an 8-inch square baking pan with parchment paper. Leave enough at the top to help you remove the fudge from the pan after it has set.
- Add the peanut butter and butter to a medium mixing bowl. Cover the bowl and microwave for a minute at a time, until the butter is melted.
- Remove the bowl from the microwave and add the vanilla and salt. Stir until the mixture is well combined. The bowl will be hot.
- Add the sugar-free powdered sweetener and stir until completely combined.
- Transfer the peanut butter fudge into your prepared pan, smoothing the top with the back of a spatula or spoon. Cover and chill for at least 6 hours or overnight.
- To cut the fudge, lift the parchment paper with the fudge out of the pan and place it on a cutting board before cutting into squares.
- Store in an airtight container in the refrigerator for up to a week. Store in the freezer for up to three months.
Notes
- Use dairy-free butter to make this keto peanut butter fudge dairy-free.
- Use a powdered sugar free sweetener. Granulated sweeteners don’t work well in this recipe.
- Stove top Directions: In a medium sauce pan, melt peanut butter and butter together over medium heat. Then follow the remaining steps above.
Nutrition Information:
Yield: 24 Serving Size: 1 pieceAmount Per Serving: Calories: 90Total Fat: 10gSaturated Fat: 0gTrans Fat: 0gUnsaturated Fat: 0gCholesterol: 0mgSodium: 29mgCarbohydrates: 2.5gNet Carbohydrates: 2gFiber: .5gSugar: 1.5gProtein: 2.5g
The nutrition information for this recipe is an approximate total per serving. Please double check the nutrition information for your exact ingredients and brands.

Tiffany
I love how simple this recipe is! I’ve never tried peanut butter fudge before but I have no excuse now!
Tiffany
Michele Crysel
I made this last night...so easy!! But-delicious!! Really takes care of that sweet tooth!!! Thanks:)
Four Score Living
I am so glad you liked it. Thank you for letting me know.
Tammany
Can this be left on the counter for a party or will it start to get soft to fadt?
Four Score Living
It will soften some. You can always put it over another pan that has ice in it, if you're worried.