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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.

    10.0K shares
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    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
    Close up shot of a bowl of sugar-free peanut butter with a bite taken out of one square.

    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!
    5 from 28 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.
    10.0K 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. Monica says

      May 09, 2022 at 2:59 pm

      5 stars
      This is another one that I keep in my fridge for that sweet tooth of mine!

      Reply
    2. Sarai says

      May 01, 2022 at 12:20 pm

      5 stars
      I did the option of more sweetener instead of the collagen and yum!

      I enjoy all of your recipes, well our entire family does! We’re doing Keto for health reasons and foods like this help to keep us on track.

      Love your cookbooks too!

      -Sarai

      Reply
    3. Bruce says

      May 01, 2022 at 10:58 am

      Sorry just saw the notes. Please disregard.

      Reply
    4. Bruce says

      May 01, 2022 at 10:52 am

      Question, is there anything else I can use in place of the collagen?

      Reply
    5. Adel says

      April 25, 2022 at 8:25 pm

      Hello, can I sub the peanut butter (nut allergy) for cashew butter? Thank you

      Reply
      • Carolyn says

        April 26, 2022 at 6:46 am

        Yes but it will be higher in carbs.

        Reply
    6. Kyrie says

      April 17, 2022 at 3:36 pm

      5 stars
      My go to dessert that the whole family loves

      Reply
    7. Robyn says

      April 11, 2022 at 10:01 pm

      5 stars
      Can’t wait to make your fudge, Carolyn. Any thoughts on incorporating some cannabis oil into the recipe? Asking for all the happy Canadians out there 😉

      Reply
    8. Beth says

      April 11, 2022 at 5:21 pm

      5 stars
      This.Is.So.Yum!!! BEST Keto PB fudge I’ve come across to date. I actually mixed some Adams Crunchy and Adams Creamy together and used that . . . didn’t pour off any oil. Came out absolutely perfect! Oh – also I added 1/3 cup of Lily’s White Chocolate Chips just before pouring it in my loaf pan. Mixed just enough to incorporate evenly but not melt them. SO GOOD! I love the little bit of crunch that using the Crunchy BP gives the fudge – but I’m a crunchy loving girl

      Reply
    9. Debra says

      April 11, 2022 at 9:10 am

      So excited, to find out I can just pour off the oil on top of the peanut butter. I always thought for best results it had to be mixed in. Thank you

      Reply
      • Carolyn says

        April 11, 2022 at 9:36 am

        Do keep in mind that the resulting PB can be very thick when you do this. It totally depends on the brand! You can also pour off some and mix in the rest…

        Reply
    10. Joyce says

      April 10, 2022 at 4:51 pm

      5 stars
      So perfect; smooth, creamy and delicious and so very simple to make. Thank you Carolyn.

      Reply
    11. Maria says

      March 10, 2022 at 8:00 pm

      5 stars
      So easy and delicious. I sprinkle Lily’s chocolate chips over half of it and swirl it with a knife to marble it.

      Reply
    12. Ann Rusnak says

      February 07, 2022 at 9:37 am

      You’re my go to Keto person and love your videos. Can’t believe I didn’t discover this recipe sooner. I’m a peanut butter freak. This turned out perfect. It’s way to sweet for my taste. Husband loves it. Carolyn, is it possible to replace some of the sweetener with the collagen?

      Reply
    13. Sonia Nelson says

      January 30, 2022 at 1:15 pm

      5 stars
      I love this recipe!!! The best!! Just make sure you don’t use too much heat or over cook! (It’s still good, but not creamy.) Thank you, Carolyn!

      Reply
    14. ken says

      January 26, 2022 at 12:30 pm

      This recipe is absolutely delicious, though experimenting I have found an even better way to enjoy them. A swirl of home made butterscotch sauce through it like a marble cake.

      Absolutely magnificent.

      Reply
    15. Camilla Lassiter says

      January 23, 2022 at 7:20 pm

      5 stars
      Just made this and it’s really good for keto fudge! My favorite is peanut butter and this made me feel happy!! Thanks for all of your wonderful recipes! I love your cool books also

      Reply
      • Carolyn says

        January 23, 2022 at 10:37 pm

        Glad you enjoyed it!

        Reply
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