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I’ve been sharing so many low carb peanut butter recipes lately! From peanut butter cups to chocolate peanut butter bars, what can I say? I’m a big fan. If you’re a peanut butter lover like me, you have to try this sugar-free low carb peanut butter fudge.
The Best Sugar-Free Keto Peanut Butter Fudge
Hands down, my favorite way to make keto low carb peanut butter fudge is this version with Dr. Axe Multi Collagen Protein. It contains five types of collagen peptide sources, including those from cows, chickens, fish and eggs. You can find it online here.
I believe collagen really can make a difference in supporting the gut, joints, muscles, bones, skin, hair, nails, and even the brain. The fine powder is tasteless, so you can stir into coffee, smoothies, and more. But, my favorite way to use it is this sugar-free peanut butter fudge. The collagen thickens it up perfectly.
Just to be clear, these statements have not been evaluated by the Food and Drug Administration. This is true of any dietary supplement, since the FDA does not officially review them. So, even though I technically can’t say that collagen treats any disease or condition, my opinion is that it makes the ultimate healthy peanut butter fudge.
But you know what really makes this the best peanut butter fudge recipe? The taste and texture! I can’t tell the difference at all between this and regular peanut butter fudge with powdered sugar. It’s pure heaven for any peanut butter lover.
Even if you disregard any potential benefits, you’re going to love this low carb peanut butter fudge. No one will guess that it’s sugar-free and keto friendly. It’s rich, soft and creamy, just like the real thing. Seriously, it tastes just like a regular old-fashioned peanut butter fudge!
How To Make Peanut Butter Fudge with Collagen
Fortunately, making easy homemade peanut butter fudge with collagen protein is incredibly easy! You only need four ingredients, plus vanilla extract, which is optional.
If you like quick and easy desserts and don’t want to cook or even turn on your oven, this one is for you. This no cook, no bake peanut butter fudge recipe only requires a little heating, which you can do in the microwave if you want. The stove-top works just as well, if that’s your preference. Either way, the entire prep takes only a few minutes.
The process to make low carb peanut butter fudge is not much different from other fudge recipes. This one just has the added bonus of being sugar-free and packed with protein. I like to keep some in my freezer for an easy keto treat on the spot.
To make this simple peanut butter fudge, you only have to apply heat for long enough to melt the peanut butter and butter together. Then, stir in the sweetener, collagen powder, and vanilla extract. Pour it into a parchment lined pan and freeze until firm. That’s it. See? I told you it was easy!
Sugar-Free Keto Low Carb Peanut Butter Fudge Recipe - 4 Ingredients:
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RECIPE CARD
Sugar-Free Keto Low Carb Peanut Butter Fudge Recipe - 4 Ingredients
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Instructions
RECIPE TIPS + VIDEO in the post above, nutrition info + recipe notes below!
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Line an 8x8 in (20x20 cm) baking pan with parchment paper, letting it hang over the sides. Set aside.
- Combine the peanut butter and butter in a large bowl (if using the microwave) or saucepan (if using the stove). Heat over low heat, stirring a few times, until melted and smooth.
- Stir in the sweetener and collagen powder, until smooth. Taste and adjust sweetener if needed. Remove from heat. Stir in vanilla extract.
Spread the mixture into the baking pan. Freeze for 30-45 minutes, until firm.
- To slice, lift the parchment paper out of the pan and place on a cutting board. Run a knife under hot water to warm it up, dry, and use it to cut the fudge into squares. Store in the freezer. If desired, soften on the counter for a couple of minutes when serving.
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Recipe Notes
This sugar-free peanut butter fudge is very filling. If you want to enjoy it as a bite size treat with fewer carbs and calories, just cut it into smaller squares.
Serving size: 1 2x2" square
Video Showing How To Make Keto Low Carb Peanut Butter Fudge:
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Nutrition Information Per Serving
Where does nutrition info come from? Nutrition facts are provided as a courtesy, sourced from the USDA Food Database. You can find individual ingredient carb counts we use in the Low Carb & Keto Food List. Net carb count excludes fiber, erythritol, and allulose, because these do not affect blood sugar in most people. We try to be accurate, but feel free to make your own calculations.
More Low Carb & Keto Support
If you want to know more about how to start a low carb diet, want to substitute sweeteners, need a food list, or need support, check these guides:
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Keto Low Carb Macro Calculator 
Low Carb Keto Food List + Printable PDF
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50 Comments
Karen
This is another delicious recipe! I didn’t have any protein powder, so used almond flour in place of it and it turned out amazing!!
Chris
This is AWESOME. Super easy to make and super delicious. I made it exactly as the recipe specified, except halved (and used a smaller dish). Also added a few Lily’s semi-sweet choc chips the second time. Thank you for sharing the recipe.
Shirley
From your comments below, are you saying that you DO have to use a protein powder for the structure of the fudge, but you DO NOT have to use a collagen powder? Does this mean that you can’t use collagen powder alone? Thanks.
Wholesome Yum M
Hi Shirley, This recipe really turns out best with the addition of either a powdered protein or collagen powder. Whatever you have on hand should work fine. It helps to provide structure to the recipe.
Holli Krebs
Thank you so much for your recipes. Do you know the difference it would make to use either protein powder or egg white powder? Thank you!
Wholesome Yum M
Hi Holli, You can use protein powder in place of the collagen. It will still turn out great! Enjoy!
Tom West
I use ice cube trays …. nice size for me
Stephanie K Molsbee
Can you substitute gelatin for the collagen? If so, is it the same amount or different?
Wholesome Yum M
Hi Stephanie, If you don’t have collagen on hand, then you can leave it out. Gelatin will not work in this recipe. The recipe will still fine work without collagen.
Betsy
Made this tonight, 1 serving, (scaled it down). Used isopure protein powder in place of the collagen. Used extra crunchy Teddy brand peanut butter and followed recipe as written. Yummmy. Hubby was very happy to as we share this 1 serving to make sure we like it. Definitely helps with the peanut butter craving.
Mary
Just made this! It is SO good! Thinking I was going to have to live without peanut butter fudge was just heartbreaking! Thank you so much for sharing this recipe! I am so glad I decided to give it a go! No doing without peanut butter fudge here now!
Betsy
Can I use isopure unflavored protein powder?
Wholesome Yum M
Hi Betsy, I think that should work. Using protein powder might give a slightly powdery texture compared to collagen peptides (which dissolve completely in liquids and foods) but I think it will still work out well.
Ana
How much salt would you add if you don’t have salted peanut butter?
Wholesome Yum M
Hi Ana, I would start with 1/2 teaspoon and then adjust to taste.
Dawn Yutzy
This is utterly amazing! It hit the spot and it’s great with tea for a bedtime snack!
Nina
Oh my gosh, this is the first keto snack that I’ve made and love it! No weird after taste, just perfect. Followed the measurements to the letter and substitute the vanilla for maple flavoring and added pecans. The smell reminded me of bit-o-honey. So satisfying.
Thank you
Alpa Modhera
Hello
Can you substitute protein collagan peptides for the protein powder?
Maya | Wholesome Yum
Hi Alpa, Yes, you can!
Josie
Absolutely perfect recipe as written! I make this at least twice a month and keep it in the freezer. The fam loves it! I use chunky, organic unsweetened PB. Thank you so much!
Amita
Hi, can you substitute almond butter?
Maya | Wholesome Yum
Hi Amita, Yes, you can!
Jeff
Can Keto recipes be doubled from 8×8 to a 9×13 pan size? And if a recipe calls for peanut butter, can powdered PB be used? Thanks tons.
Maya | Wholesome Yum
Hi Jeff, Yes, you can double it. I don’t recommend powdered peanut butter for this recipe, though.
Pamela
OMG!! I am in peanut butter fudge heaven!! This recipe is AMAZING! I added a few pecans in it. Thanks so much for this recipe!!! I LOVE IT!
Maya | Wholesome Yum
I love that you added pecans, Pamela!
Renuka
Hi Maya, This recipe and the feedback makes it sound like a winner. Can’t wait to try it. But I’m vegetarian. What can I use in place of the collagen?
Maya | Wholesome Yum
Hi Renuka, Another protein powder, like egg white protein powder or pea protein powder should work.
Jana
Can I use Great Lakes collagen?
Maya | Wholesome Yum
Hi Jana, I didn’t test with that brand but I’m sure you can.
Phil
Can’t use natural peanut butter, too loose.
Maya | Wholesome Yum
Hi Phil, Did you try the recipe? I used natural peanut butter without a problem.
Carol Stackhouse
Thank you so much!
Maya | Wholesome Yum
You are welcome, Carol! Thanks for stopping by!
Stacy
This is wonderful fudge! We all love it!
Maya | Wholesome Yum
Thank you, Stacy!
Tara
Thanks for sharing this recipe. Peanut butter fudge is near and dear to my heart as I have been making an old family recipe for years. With going keto, I have been thinking about how to convert the recipe to a low sugar version. I would like to figure out a way to get it to set up without freezing it. Thanks for turning me onto collagen.
Maya | Wholesome Yum
Thank you, Tara! I’m glad you can enjoy this recipe!
Diane
Addicting. I make a batch to have in the freezer at all times. Sometimes smooth PB sometimes chunky. This recipe is perfect!
Maya | Wholesome Yum
Thank you, Diane!
Gloria
Do you have to use a protein powder or can you skip this ingredient?
Maya | Wholesome Yum
Hi Gloria, You need the protein powder. It provides structure.
Victoria
Does it have to be collagen protein powder? Or can regular protein powder suffice?
Maya | Wholesome Yum
Any kind will work, I just like the benefits of collagen.
Brittany
Can you use any collagen powder?
Maya | Wholesome Yum
Hi Brittany, Yes, you can.
Brittany
These are SO GOOD and it was SO EASY. Definitely one of my favorite keto recipes. This one will be staying in frequent rotation.
Maya | Wholesome Yum
Thank you, Brittany!
Cristina Kadonsky
Can I use another powder and which one? I don’t have a collagen one and this looks so great!
Maya | Wholesome Yum
Hi Cristina, I haven’t tried it with a different protein powder, but think it should work fine. I hope you’ll try the collagen sometime – you can get it from the link on the recipe card.