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    Home » Gluten Free » Keto Peanut Butter Fudge

    Published: Jan 16, 2021 · Modified: Jan 26, 2021 by Carolyn

    Keto Peanut Butter Fudge

    This post may contain Amazon or other affiliate links. As an Amazon Associate I earn from qualifying purchases.

    12.5K shares
    Jump to Recipe Print Recipe

    Super creamy and rich, this keto peanut butter fudge recipe is the ultimate low carb and sugar-free treat for peanut butter lovers. It’s so easy to make, with only a few basic ingredients. Only 3g carbs per serving!

    Titled image of keto peanut butter fudge cut into squares on a wooden cutting board

    I can’t get this easy keto peanut butter fudge out of my mind! I updated the recipe recently and now it’s even better and easier than ever. I gave half of it away to my next door neighbour and I regret that now. Deeply.

    At least it’s so easy to make, I can whip up a new batch any old time. And I will, believe me.

    I have a number of sugar-free fudge recipes but most of them are chocolate based, like my keto rocky road fudge, or my dairy free keto chocolate fudge. They are wonderful and easy to make, but peanut butter makes a welcome change from all the chocolate.

    Simplifying Keto Peanut Butter Fudge

    I have to admit that sometimes I have a tendency to make things more complicated than they need to be. And this recipe is a perfect example.

    Back when I first made it in 2017, I was attempting to make “old fashioned style” peanut butter fudge. I was trying to avoid the all-too-common low carb trick of adding cream cheese to get a more fudge-like consistency, because I do not enjoy the flavor of cream cheese in my fudge.

    Making old fashioned fudge is a much more laborious process wherein you boil milk, sugar, and butter together until they reach the soft ball stage of candy making. Then you add the peanut butter and powdered sugar and beat the mixture for several minutes as it cools and thickens. You have to watch it carefully because it can go from almost liquid to too thick in moments.

    It’s not a simple process and it relies on ridiculous amounts of sugar (at least 2 cups) to create the right consistency.

    My first iteration of this keto peanut butter fudge mimicked that process, and used 1 ½ cups of sweetener. But keto sweeteners aren’t the same as sugar and don’t produce the same consistency. So I found myself adding some peanut flour to help it set properly. It was good, but more complicated than it needed to be.

    Then it hit me that I was already sitting on the perfect peanut butter fudge recipe and had been for years and year. My Keto Peanut Butter Brownies, which I first created in 2013, had a delicious fudge-like topping. Why not simply make a bigger version of that?

    A brick of keto peanut butter fudge being cut into squares

    A healthier fudge recipe with collagen protein

    But never one to leave well enough alone, I still modified this recipe a little and added some keto collagen peptides. I don’t like overly sweet desserts anymore and using some collagen powder allowed me to reduce the powdered sweetener and still end up with an amazing creamy fudge.

    Many keto dieters use collagen on a daily basis, for its myriad health benefits. It’s said to be very good for hair, skin, and joint health. It’s also a great source of healthy proteins.

    I use the Perfect Keto Salted Caramel Collagen in my mid-morning cappuccino almost every day. It’s so good and makes for extra frothy coffee drinks. I cannot recommend it enough.

    For this recipe, however, I used the plain unflavoured collagen, as I wanted the peanut butter to shine through. If you would prefer not to use collagen at all, you can add an additional ¼ cup to ⅓ cup powdered sweetener.

    FYI that Perfect Keto offers all of my readers 15% off with code ALLDAY15

    Squares of keto peanut butter fudge in a white bowl with a plaid orange napkin and a bowl of peanuts

    Tips for making Keto Peanut Butter Fudge

    This keto fudge recipe is so simple and whips up in about 10 minutes. Here are my best tips for getting it right:

    Line your loaf pan

    This is a requirement if you want to get your fudge out in nice pieces. You can use waxed paper or parchment paper. Really press it into the corners and have overhanging edges so you can lift the whole batch of fudge out easily before cutting.

    Use creamy peanut butter

    There are a number of good all natural peanut butters on the market now that are nice and creamy. The creamier the peanut butter, the creamier your fudge will be.

    If your peanut butter that has a lot of oil at the top, try to get as little of the oil into the mix as possible, as it can throw off the consistency and make the fudge too soft. A no-stir peanut butter is definitely a better option.

    Salted or unsalted butter?

    I personally use salted butter because I enjoy it in my sweets and think it brings out flavor. But some people are very sensitive to salt and if you’re one of them, you may want to use unsalted butter.

    The powdered sweetener

    A powdered sweetener is key to avoiding a gritty texture. Do keep in mind that I only tested this with Swerve and can’t say that it will work that well with other sweeteners. Some may make the mixture too soft and it won’t set properly. Check out my guide on keto sweeteners here for more details.

    Collagen powder for consistency

    Add collagen powder allows you to reduce the sweetener while still getting a wonderful creamy fudge texture. But if you can’t get any or you prefer not to use it, you can add an additional ¼ cup of powdered sweetener and achieve the same result.

    How to store Keto Peanut Butter Fudge

    I personally like this fudge best at room temperature and as long as your ingredients are fresh, it can last for up to 4 days in a covered container.

    If it will be around longer than that, it’s best to store in the fridge and it should last for several weeks. Store it in a sealed container to avoid the fudge taking on the flavors of other refrigerated items.

    Ready to make some easy keto peanut butter fudge? I think you will love it!

    Close up shot of a bowl of sugar-free peanut butter with a bite taken out of one square.

    Try these other keto peanut butter recipes!

    • Keto Peanut Butter Mousse
    • Keto Peanut Butter Cookies
    • Keto Peanut Butter Mug Cake
    • Easy Keto Peanut Butter Cups
    • Keto Peanut Butter Granola
    • Keto Peanut Butter Chocolate Chip Skillet Cookie
    A small cutting board piled with sugar free peanut butter fudge and roasted peanuts.

    Keto Peanut Butter Fudge

    Super creamy and rich, this keto peanut butter fudge recipe is the ultimate low carb and sugar-free treat for peanut butter lovers. It's so easy to make, with only a few basic ingredients. Only 3g carbs per serving!
    4.99 from 50 votes
    Print Pin Rate
    Course: Dessert
    Cuisine: American
    Keyword: easy peanut butter fudge, keto peanut butter fudge
    Prep Time: 5 minutes
    Cook Time: 5 minutes
    Chill time: 1 hour
    Total Time: 10 minutes
    Servings: 15 servings
    Calories: 178kcal

    Ingredients

    • 1 cup unsweetened creamy peanut butter (add a pinch of salt if it's unsalted)
    • ½ cup butter
    • ½ teaspoon vanilla extract
    • ¾ cup powdered Swerve Sweetener
    • ⅓ cup collagen peptides (see notes)
    US Customary - Metric

    Instructions

    • Line a loaf pan (8x4 inch or 5x9 inch) with waxed paper.
    • In a medium saucepan over low heat, combine the peanut butter and butter. Stir until melted, then stir in the vanilla extract.
    • Whisk in the sweetener and collagen until well combined and smooth. Pour the mixture into the prepared pan and refrigerate until set, about 1 hour.
    • Lift the waxed paper out by the edges and cut the fudge into 15 pieces.

    Video

    Notes

    If you would prefer not to use collagen, you can add another ¼ cup to ⅓ cup Swerve Confectioners. 
    Nutrition Facts
    Keto Peanut Butter Fudge
    Amount Per Serving (1 piece)
    Calories 178 Calories from Fat 126
    % Daily Value*
    Fat 14g22%
    Carbohydrates 3.9g1%
    Fiber 0.9g4%
    Protein 8.3g17%
    * Percent Daily Values are based on a 2000 calorie diet.
    12.5K shares

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    Nutritional Disclaimer

    Please note that I am not a medical or nutritional professional. I am simply recounting and sharing my own experiences on this blog. Nothing I express here should be taken as medical advice and you should consult with your doctor before starting any diet or exercise program. I provide nutritional information for my recipes simply as a courtesy to my readers. It is calculated using MacGourmet software and I remove erythritol from the final carb count and net carb count, as it does not affect my own blood glucose levels. I do my best to be as accurate as possible but you should independently calculate nutritional information on your own before relying on them. I expressly disclaim any and all liability of any kind with respect to any act or omission wholly or in part in reliance on anything contained in this website.

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      Recipe Rating




    1. Sandra W. says

      January 18, 2023 at 3:49 pm

      5 stars
      Peanut Butter Fudge is a weakness. So I was super excited when I found your recipe. I made it last weekend and WOW am I amazed. Wish I could post a picture here.

      Reply
    2. Grace says

      December 30, 2022 at 10:02 pm

      5 stars
      I made this tonight. Everyone loved it! Even my kids loved it! And I loved that it was super simple to make. I definitely plan on trying your chocolate recipe next!

      Reply
    3. Heather says

      December 29, 2022 at 2:48 pm

      let me know when you have a butterscotch/caramel/vanilla fudge. or turn yiur caramel sauce into fudge. that’s my favorite and I know you love a challenge. 🤩

      Reply
    4. Susan Yakus says

      December 29, 2022 at 9:45 am

      5 stars
      Would I be able to use Great Lakes Beef Collagen?

      Reply
      • Carolyn says

        December 30, 2022 at 12:39 pm

        Yes.

        Reply
    5. Lorry Norton says

      December 13, 2022 at 4:35 pm

      5 stars
      This sounds so good!!! I don’t have Collagen peptides. I do, however, have peanut powder. Could I use that instead?

      Reply
    6. Rosemary brenner says

      November 12, 2022 at 10:52 pm

      5 stars
      A trick. Leave your peanut butter upside so when you open it, the oil is on the other end ‼️‼️

      Reply
    7. Kaycee says

      November 10, 2022 at 6:33 am

      5 stars
      Which peanut butter did you use? I want to make sure I don’t end up with a runny mess!

      Reply
      • Carolyn says

        November 10, 2022 at 3:25 pm

        I really like Santa Cruz https://amzn.to/3NWOmnl

        Reply
    8. Susan A says

      November 05, 2022 at 2:55 pm

      5 stars
      Amazingly good!!!!!

      Reply
    9. Suzy says

      November 05, 2022 at 3:50 am

      5 stars
      This has become one of our favorite desserts. Thank you for this recipe!!

      Reply
    10. Rose says

      October 29, 2022 at 12:26 pm

      5 stars
      I had this recipe for awhile and just was lazy …..
      well I made it yesterday
      wow wow wow wow
      amazing awesome and very hard to stop eating

      Reply
    11. J Ehlers says

      September 25, 2022 at 2:51 pm

      4 stars
      The flavor was excellent. Any suggestions to keep it from getting grainy? I followed the recipe with no substitutions.

      Reply
      • Carolyn says

        September 25, 2022 at 6:02 pm

        Mine was never grainy so I am not sure what’s going on. Try making sure your peanut butter and butter aren’t too hot when you add the sweetener.

        Reply
    12. Whitney says

      September 18, 2022 at 5:58 pm

      5 stars
      I used macadamia nut butter and sprinkled the top with keto white chocolate chips- no regrets! It was phenomenal

      Reply
      • Carolyn says

        September 19, 2022 at 12:36 pm

        Delicious!

        Reply
    13. Stephanie B says

      September 07, 2022 at 6:49 am

      5 stars
      I made this yesterday! Even my picky teenager who avoids my low carb/keto food items liked it! Thank you for all you do!

      Reply
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