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Easiest Sugar-Free Keto Peanut Butter Fudge

With only 4 ingredients and 1.7 net carbs per piece, this easy keto peanut butter fudge will be ready in no time at all. Besides being sugar-free it’s so rich, creamy, delicious and perfect for all of your guests. 

Sugar-Free Peanut Butter Fudge Easy

I was in the mood for fudge lately, which is weird because I’m not a big fudge person but since our easy chocolate fudge recipe came out so well, I thought I’d make another one. This time I decided, “Let’s try a Peanut Butter Fudge!” 

My husband is not only a big lover of fudge, but he loves anything peanut butter so I figured it would be a win, win situation. And I was right! He loved it! In fact, everyone that came over this weekend loved it too, which made me very happy. 

Is Peanut Butter Fudge Low Carb?

Yes, our peanut butter fudge is low carb. In fact, it’s only 1.7 NET CARBS per piece! 

This time I cut my fudge into smaller pieces than my chocolate fudge, which I found to be better. It will serve more people and I feel like it’s the perfect bite-size piece of sugar-free fudge. 

What Ingredients are in Keto Peanut Butter Fudge?

Peanut Butter Fudge ingredients

Peanut Butter – Make sure you creamy natural peanut butter, with no added sugar and no added oil. Read the ingredients list and it should only say roasted peanuts on the label. I use creamy peanut butter, not chunky because you want your low carb peanut butter fudge to be nice and smooth. 

Sweetener – Powdered sweetener is the best for this recipe, using a granulated one will make your fudge too grainy. My go-to is Powdered Swerve, but I’ve heard good things about Lakanto Powdered Sweetener as well. 

Vanilla – I use about 2 tsp of vanilla, but feel free to adjust. 

Butter – I chose to use butter but you can use ghee or coconut oil instead if you want to keep it vegan. Just keep the quantity the same and you’re good to go.

Using the Right Peanut Butter for Sugar-Free Fudge

So make sure you are using natural peanut butter, with no added sugar and no added oil. It needs to be made with just peanuts.

My favorite brand is Nature’s Promise Organic Creamy Peanut Butter.  

The Sweetener

When it comes to using a sweetener for your sugar-free peanut butter fudge, I would only use a powdered low carb sweetener like powdered Swerve. Using a granulated sweetener isn’t going to mix well with your peanut butter and will be grainy. 

Another powdered low carb sweetener is Lakanto Powdered Sweetener. I personally haven’t tried this yet, but I like all of their products I’ve tried so far. 

How to Make Keto Peanut Butter Fudge

In a medium saucepan add the peanut butter and turn onto medium heat. 

stirring Peanut Butter Fudge

Then add the butter and vanilla. Stir ingredients together, and keep stirring so it doesn’t stick to the bottom of the pan. The peanut butter should start to thin out a bit. 

Add in the powdered swerve and mix together really well. Now the mixture should be thicker.

Line an 8×8 pan with parchment paper so it’s easy to get your fudge out after it’s chilled. 

Pour the fudge mixture into the pan and spread evenly with a spoon or you can use your hands. But be careful, it’s hot! 

making sugar free Peanut Butter Fudge in dish

Sprinkle chopped peanuts over the top of the fudge. 

Low Carb Peanut Butter Fudge ready to eat

Put the pan in the fridge to set for about 30-60 minutes. 

cutting Peanut Butter Fudge

Once the fudge has completely firmed up, you can start cutting it. You can cut it into however many pieces you want, I cut them into 36 small squares.

Keep it from Sticking to the Pan

One of the problems with fudge is that it can be really easy to let it stick to the pan. The solution though is simple, simple, simple!

All you need to do is line the baking pan with parchment paper. There is no need to spray your pan with any cooking spray or coat the pan with butter. That will just make your fudge greasy, and you don’t want that. Parchment paper is a perfect and easy solution.

Getting the Right Consistency

Don’t get too worried about the consistency while making this easy low carb fudge. The fudge will thin out at first, but then all of a sudden it will start to thicken up really quickly. 

Just keep stirring it while on the stove to make sure it’s nice and creamy. Once you add the powdered sweetener, it will be really thick and hard to stir. Just stick with it and make sure it’s really combined. 

It’s going to be a much thicker consistency than my chocolate fudge recipe, so don’t get alarmed it’s completely normal. 

Can You Make Peanut Butter Fudge in the Microwave?

Best Keto Peanut Butter Fudge Recipe

This keto peanut butter fudge can be made in the microwave no problem. Get a microwavable bowl, and add peanut butter, butter, and vanilla. 

Cover with a paper towel so help it from splattering, and microwave for 30-second increments, stirring in between. Add the powdered swerve, stir until well combined. 

Tips for Making Keto Peanut Butter Fudge

  • There are some fudge recipes that use condensed milk. I don’t use it in my recipe but you still can. I have a great sugar-free condensed milk recipe you can use here. 
  • Make sure to use powdered sweetener and not granulated to keep the consistency right. 
  • Your peanut butter label should say it contains only one ingredient…peanuts. 

Toppings and Different Ways to Make Sugar-Free Peanut Butter Fudge 

Keto Sugar-Free Peanut Butter Fudge Recipe

I’d say anything that goes well with peanut butter can be added as a topping but of course, we all know that peanut butter and chocolate go together perfectly. So a few things that go nicely on top of your peanut butter fudge:  

  • chopped peanuts
  • chocolate chips
  • chocolate chunks 

Other Diets this recipe is good for

  • This is a great gluten-free treat you and your family or friends. 
  • My exact recipe for this low carb peanut butter fudge is not dairy-free but that can be changed. Replace the butter with ghee or coconut oil. 
  • If you replace the butter with ghee or coconut oil, this recipe also becomes a vegan peanut butter fudge.

How to Store Peanut Butter Fudge

To prevent your fudge from getting too soft, keep them stored in the fridge. Put in an airtight container and it will stay fresh for a couple of weeks. Don’t let it sit out at room temperature for too long because it will completely soften and get gooey. 

Can I Freeze Peanut Butter Fudge?

Yes, you can keep your keto fudge in the freezer to make it last longer. Take it out for a few minutes before you want to eat it just to let it soften up a bit. 

Sugar-Free Peanut Butter Fudge Recipe

Low Carb Dessert Recipes

If you’re in the mood for some other Keto-friendly Desserts, check out our:

All of them are Keto-friendly and low carb, and will have your friends raving!

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Sugar-Free Keto Peanut Butter Fudge Recipe

Easiest Sugar-Free Keto Peanut Butter Fudge

  • Author: Stephanie Parlegreco
  • Prep Time: 5 minutes
  • Cook Time: 5 minutes + (50 minutes to chill)
  • Total Time: 60 minutes
  • Yield: 36 Servings (1 Square per Serving) 1x
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With only 4 ingredients and 1.7 net carbs per piece, this easy keto peanut butter fudge will be ready in no time at all. Besides being sugar-free it’s so rich, creamy, delicious and perfect for all of your guests.


  • 1 jar natural creamy peanut butter (no added sugar, no added oil)
  • 2 tsp vanilla
  • 6 tbsp butter
  • ¾ cup powdered swerve
  • 2 tbsp chopped dry roasted peanuts




Use no added sugar creamy peanut butter

The recipe can be made in the microwave or on the stovetop

Can last several weeks stored in the fridge

You can store in the freezer for up to 3 months

Make sure you line the pan with parchment paper before pouring the fudge into the pan

  • Category: Desserts
  • Cuisine: American

Keywords: Keto Peanut Butter Fudge, Keto Peanut Butter Fudge Recipe, Sugar Free Peanut Butter Fudge, Sugar-Free Peanut Butter Fudge Recipe, Low Carb Peanut Butter Fudge, Low Carb Peanut Butter Fudge Recipe, How to Make Peanut Butter Fudge, How to Make Keto Peanut Butter Fudge, Peanut Butter Fudge Keto, Peanut Butter Fudge Sugar Free

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Recipe rating


Saturday 13th of February 2021

I make many types of fudge but not keto friendly. But none of them have to be refrigerated to set properly or remain set. Can this fudge be left on the counter and still set properly with never being refrigerated? Thank you.

Leigh Oskwarek

Wednesday 17th of February 2021

Hi Chuck I think it will set on the counter, but I'm not 100 % sure. Try it and let us know. If it works that way we can add it to the recipe card. Thanks


Sunday 28th of June 2020

Your chocolate fudge may be the best my family and I have ever had so I thought I'd try your peanut butter fudge. I need a clarification - the recipe calls for 1 jar of natural creamy peanut butter but how big is that jar? The grocery store had different sizes.


Leigh Oskwarek

Monday 29th of June 2020

Hi Tom, We are glad that you loved our chocolate fudge so much. I hope you like the peanut butter one too. let us know. The peanut butter jar is 16 oz