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!
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 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
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!
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
Keto Peanut Butter Fudge
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)
Instructions
- Line a loaf pan (8×4 inch or 5×9 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.
Vicki Stroud says
You have snippy comments about people posting recipes with cream cheese in them and passing them off as fudge. Last time I made any of my fudge recipes, not one of them called for ANY sort of flour. So, I would say this is actually a recipe for some sort of peanut butter brownie.
Lisa Nuest says
Does peanut butter flour cause blood sugar spikes? Could I use coconut flour instead?
Carolyn says
No, it doesn’t. No, coconut flour would not work here.
Grant says
Made this tonight but something went bust.
The butter separated out at the end before I could get it into pan.
What did I do wrong?
Carolyn says
Sounds like your heat was too high for a bit. Did you add peanut flour? That usually brings it back together.
Lisa says
Really loving this recipe – made a batch a week ago and it’s juuuuust reaching the end.
I wonder if you can incorporate cocoa powder for a peanut-butter-chocolate-swirl variation!
Carolyn says
Sure! I would take maybe 1/3 of the mix to make it. And I’d do the cocoa powder instead of the peanut flour so it’s not too dry and crumbly.
lisa says
I tried this last night to serve to guests……WOW! So good. No signs of low carb or Keto or fake sweeteners! I had peanut flour from Trader Joes that I bought awhile ago. It was super easy to make too!
Carolyn says
Yay, so glad you like it!
Sarah G says
My son and I made it because he loves PB. We also added a chocolate ganache for fun. Really good! Thanks!
Carolyn says
Yay!
Jenny says
YAY!!!! Thank you for this!
Toni Pierce says
I made this recipe yesterday. It’s awesome!! Finally I have a peanut butter fudge recipe that actually tastes like fudge! Now I need to do a chocolate fudge.
Carolyn says
I am working on the chocolate one!
Sarah G says
Hmmm, I don’t currently have peanut flour. Could I use peanut powder maybe combined with some almond flour?
Carolyn says
The peanut powder is essentially the same thing, I believe.
Sarah G says
That will be great! Trying it today.
Tanya P. says
I bet you could also use vanilla or peanut butter flavored protein powder. (Quest has a peanut butter flavor.)
Lori Kaumans says
Hahaha! I LOVE this comment: “Cream cheese ain’t got no business being in my fudge!” Amen, sister! Amen! Can’t wait to try this recipe.
Cindy Maddux says
Thank you a million times…I think you just saved my life.
Pam says
Oh yum!!! I got to get me some peanut flour. Thank you!
Tracy says
I so agree with you. I tried a cream cheese fudge recipe and while it tasted ok I also did not like the consistency or the weird tangyness of it. I have passed up all recipes for any kind of fudge with cream cheese. I can’t wait to try this. Peanut butter is a passion of mine and I’m sure this will be delicious.
patricia says
wondering the same thing on the brand of peanut butter. would it be possible to use almond butter instead?
Thanks
Carolyn says
It should, as long as it’s the kind that isn’t too runny.
Kapu says
What brand of peanut butter did you use?
Carolyn says
Justin’s
kotton says
Can I just Costco brand? (Kirkland)
Carolyn says
Sure… not sure what the consistency is so please read the tips section.
Carrie says
Yes!!! I tried a batch of fudge with cream cheese in it and threw it out! Coincidentally, here to for, the best recipe I have for peanut butter fudge is the middle layer of peanut butter from one of your other recipes. My whole family loves it. I can’t wait to try this one!
Julie Blanner says
Looks delicious! Definitely need to try it myself!
Toni Pierce says
I am SO happy to see a fudge recipe that doesn’t include cream cheese! Those recipes do NOT taste like fudge to me. I’m going to make this today! Looks awesome.
Michele says
Can the collagen be replaced with whey protein powder?
Carolyn says
No, it will be gritty and gross. It doesn’t dissolve in the same way and doesn’t provide the same sort of structure.
Angela Meissner says
Thank you SO much. Cream cheese in fudge is horrible (did I say that out loud…oops). I have been waiting for a recipe like this. You are wonderful!!!
Louise says
can find the printable version…been clicking everywhere….why isn’t the recipe at the end so you can print?????????????
Carolyn says
Click the link right above the big picture. That’s why it’s in large font.
Jean says
Why not just insert the recipe instead of a link? And why does everybody feel the need to write a book every time they share a recipe? Everybody just scrolls through it to the recipe.
Carolyn says
Why not just enjoy what I offer you for free? 🙂
Janet says
I really enjoy your posts. I have learned so much from reading them…and I am so grateful for all of the recipes you provide. They have helped me keep on track with my diabetes. I would never have been able to get off my meds without you!!!! There are so many of us who appreciate all that you do! Thank you so much!!!!!
Dawn says
?. Exactly
Bonita says
I found your post very entertaining.keep on posting!
Mandy says
I think I love you. I mean, you have great recipes…but you make me laugh and it’s fantastic that you’re so real. Thank you!
Carolyn says
🙂 Thanks so much. Glad I could give you a giggle.
Sandy Bloomfield says
Carolyn, so sorry you have to deal with rude people who also seem to feel entitled when they should just be grateful for all you do to make our lives a bit sweeter…your responses always make me smile 😉
Rose says
Hiya! What peanut butter do you use?
Thank you for blogging and sharing yummy recipes. 🙂
Carolyn says
Depends on what’s on sale. I really like Justin’s but it has no salt added, whereas the Thrive Market brand does and is just as creamy.
Ann says
❤️????????
Holli says
I love your sharing, it makes me smile and I learn a lot from your tips. Your gifted with cooking for sure. Thanks for sharing your recipes they are awesome.
Cat says
I appreciate you!!
Chris Staats says
Carolyn, Your comment literally made me LOL! Great reply. I absolutely love love love every single one of your recipes that I have tried! You are the one I refer people to when starting Keto and they want recipes! YOU are MY go-to! Keep up the fanfreakintastic work!
Pinky says
Why must you complain? Don’t like it, create your own damn blog.
me says
amen to that!!!
Heather says
It’s called a BLOG. And is FREE. You can just as easily go right to the recipe, also, instead of complaining about it. I, for one, am very grateful for everything that is offered on this blog.
Becca C says
Jean, in all honesty, I get what you’re saying — BUT!!! 1, I enjoy reading the stories behind the recipes, and 2, if the recipe is her’s she has the right to put it where she wants… as well as set up her page as she wants.
I personally don’t like all the ads, but knowing they have them, so they can offer us FREE recipes… I’ll deal with them…
AND NOT COMPLAIN.
If you really don’t like the recipe site format… don’t visit any more. You can block addresses so you don’t go to them and get frustrated.
As for recipe creator — I’m going to go looking for your recipe. I typically hate fudge because it’s got marshmallows in it, which gives it a weird flavor and sometimes a weird texture. Sigh. That’s the type of fudge I grew up on… chewy, but not a solid break when breaking it apart… but thankfully, have a couple stores close by that make fudge correctly, and I get my fix that way. Haha.
tojeanthecomplainer says
and whycomplain! You are lucky there are people who share their keto recipes
you just had to chose carolyn to complain about it
Brenda says
Oh Jean you shouldn’t be so grumpy.