Keto Peanut Butter Brownies make your mouth water! These fudge low carb brownies are topped with a rich sugar free peanut butter fudge and a sweet chocolate glaze. Heavenly!
Did I ever tell you about the time that I took some decadent low carb brownies and topped them with a thick layer of keto peanut butter fudge? Well, let me refresh your memory, because it just so happens that I did it again. And again. And maybe again…
You know I love keto brownies. And you know I love all things chocolate and peanut butter. Putting them together into one mouthwatering package was just the smart thing to do.
I first created this recipe way back in 2013. And every so often, I update them to see if there is any room for improvement. Trust me, you will be glad I did!
You will love this sugar free dessert!
These tasty treats could also be called Buckeye Brownies. Or peanut butter fudge brownies. Or “the most delicious thing I have ever eaten” brownies. Feel free to call it as you see it.
They really don’t take much effort either. Each element is quick and easy to make. The hardest part is waiting for them to chill properly so the peanut butter filling doesn’t goo out everywhere.
But they look like you spent ages in the kitchen. And they are bound to please anyone who loves chocolate and peanut butter together. I dare them to tell that they are sugar-free!
Each brownie has only 4.2g of net carbs, so they are perfect for your low carb diet.
Reader Reviews
“Carolyn, I’ve been baking from your website since I have gone keto for medical reasons. Your recipes save me! These brownies with the peanut butter topping are seriously amazing!! I thought 16 pieces would make them so small and unsatisfying, but they are rich and gooey and the perfect treat to help sweet-toothers survive the keto life. Thank you a million times for your awesome keto treats!!!” — Christine
“So, I use your recipes all the time. I just tried this one. You rock! My husband said we should send you flowers for this one. I have never had a bad recipe from this site. Amazing!” — Madelynn
“I am a major keto foodie. This is the best brownie recipe (both ultimate brownie recipe and peanut butter brownie recipe). Nothing works quite like this. Genius gelatin! I’ve tried an ocean of low carb, grain free, sugar free brownie recipes, and nothing compares to this recipe. Thanks, Carolyn. Bonus: You just changed my chocolate and peanut butter loving husband’s life, but Even though he gives me all the credit, we both know it’s all you! Thanks again! The recipe is genius!” — Shannan V.
Ingredients you need
- Keto brownie base: You will need to make a batch of keto brownies recipe first. If you want to be nut free, you can use my coconut flour brownies. You can also use your favorite brownie mix.
- Peanut butter: I recommend a really smooth natural peanut butter for the best filling consistency. I love Santa Cruz brand, but Justin’s is also good.
- Butter: You can substitute the butter with coconut oil.
- Powered sweetener For making the fudge, powdered sweetener blends in better and does not give a gritty texture like a granulated sweetener would.
- Heavy whipping cream: The topping of these brownies is a rich chocolate ganache made with heavy cream.
- Dark chocolate: I used Lily’s dark chocolate chips for my chocolate topping. ChocZero should work as well.
- Pantry staples: Vanilla extract and salt.
Step-by-step directions
1. Prepare the brownies: Line a 9×9 inch metal baking pan with parchment, with an overhang for easy removal. Prepare the keto brownie batter as directed (skipping the added chocolate chips) and pour into the pan. Bake the brownies for 15 to 18 minutes and let cool in the pan.
2. Melt the peanut butter: In a medium microwave safe bowl, combine the peanut butter and butter. Melt on high until they can be stirred together. Alternatively, you can do this in a pan on the stovetop over low heat.
3. Add the sweetener: Stir in the vanilla and the salt, then stir in the powdered sweetener, whisking vigorously to combine. Spread over the cooled brownies and refrigerate until set, about 1 hour.
4. Prepare the ganache: In a small saucepan over medium low heat, bring the cream to just a simmer. Remove from heat and add the chocolate chips. Let sit 5 minutes to melt, then whisk until smooth.
5. Pour over the filling: Pour the chocolate topping over the peanut butter and use an offset spatula to spread to the edges.
6. Let set: Return to the fridge for another 30 minutes or so to set the chocolate. Lift the brownies out by the edges of the parchment and cut into squares.
Expert tips
I like to make sure my brownies are super fudgy by taking them out at the 15 minute mark. But you can make them more cakey by cooking until the 18 or 20 minute mark.
Use the creamiest peanut butter you can find. A lot of natural peanut butters tend to be a big gritty. If yours has a lot of oil on top, make sure you blend it in really well before measuring it out.
Both the peanut butter fudge and the chocolate topping are quite sweet so feel free to cut back on the sweetener in the brownies if you wish. I tend to do so!
Sweetener Options
You can make the brownies with any sweetener you like, but do keep in mind that allulose may make them darken quickly and may even taste a little burned.
The peanut butter topping will require a powdered sweetener to avoid grittiness. It also needs a bulk sweetener (i.e. not a concentrated extract) so that firms up properly and has a fudge-like consistency.
Frequently Asked Questions
This peanut butter brownie recipe has 6.9g of carbs and 2.7g of fiber per serving. That comes to 4.3g net carbs per brownie.
Store the brownies in a covered container on the counter for up to 4 days, or in the fridge for a week for up to 10 days.
It’s easy to freeze brownies for later consumption and keto meal planning. You can remove them from the pan and wrap them up tightly to avoid freezer burn. You can also wrap each one individually for better portion control.
More amazing keto brownie recipes
Keto Peanut Butter Brownies Recipe
Ingredients
Brownie Base
- 1 recipe Ultimate Keto Brownies (omit the added chocolate chips)
Peanut Butter Fudge
- ¾ cup peanut butter
- 6 tablespoon butter
- ½ teaspoon vanilla
- ¼ teaspoon salt
- ½ cup Swerve Confectioners or other powdered sweetener
Chocolate Glaze:
- ½ cup heavy whipping cream
- 3 ounces sugar-free dark chocolate chips
Instructions
Brownie Base
- Line a 9×9 inch metal baking pan with parchment, with an overhang for easy removal. Prepare the keto brownie batter as directed (skipping the added chocolate chips) and pour into the pan. Bake the brownies for 15 to 18 minutes and let cool in the pan.
Peanut Butter Fudge
- In a medium microwave safe bowl, combine the peanut butter and butter. Melt on high until they can be stirred together. Alternatively, you can do this in a pan on the stovetop over low heat.
- Stir in the vanilla and the salt, then stir in the powdered sweetener, whisking vigorously to combine. Spread over the cooled brownies and refrigerate until set, about 1 hour.
Chocolate Ganache
- In a small saucepan over medium low heat, bring the cream to just a simmer. Remove from heat and add the chocolate chips. Let sit 5 minutes to melt, then whisk until smooth.
- Pour the chocolate topping over the peanut butter and use an offset spatula to spread to the edges.
- Return to the fridge for another 30 minutes or so to set the chocolate. Lift the brownies out by the edges of the parchment and cut into squares.
Kim says
I have been doing keto for 9 months and this is my favorite recipe! I make a batch of just the peanut butter fudge every other week! Thank you. Amazing recipe!
Carolyn says
So glad you like it!
Wenda says
I love these brownies..the peanut butter fudge and chocolate on top are delicious…Thank you for this recipe!
I only added. 1 TBS water to the brownies, and they were perfect!
I’ve made so many of your recipes❤️
Lynette says
Unbelievably amazing!! 10 stars! Thank you so much for this amazingly delicious recipe! XOX
Melissa says
Delicious! Thank you so much for this great recipe, I can’t wait to try your salted caramel bars.
Joyce says
Carolyn – Loved your original recipe and made it more times than I can count for my daughter and me. Excited to try out the revamped version for myself, but my daughter can’t eat almond flour unfortunately. Is the original brownie base recipe from 2013 still available as I couldn’t find it on your site. I wish I had printed it as this was my daughter’s absolute fave recipe of yours!
Carolyn says
Hi Joyce… Use the search box and type in “peanut butter swirl brownies”. The base of that is the old brownie. You could also try using sunflower seed flour in place of the almond flour. It works well.
Joyce says
Hi Carolyn – Thanks so much for your quick reply!! I see that the PB swirl recipe also lists almond flour so should I just omit it? Is the original recipe in your Everyday Ketogenic Kitchen book by any chance, as I just ordered it? Can’t wait to get it!
Carolyn says
Darn, I thought that one was flourless. Try this one instead but replace the liqueur with water or almond milk. https://alldayidreamaboutfood.com/irish-cream-brownies-low-carb-and-gluten-free/
Joyce says
Thanks Carolyn! I also did some searching and I think the base of your Raspberry Cheesecake Swirl brownies might use the original recipe. So many wonderful recipes, so little time! You’re awesome!
Shannan Vega says
I am a major keto foodie. This is the best brownie recipe (both ultimate brownie recipe and peanut butter brownie recipe). Nothing works quite like this. Genius gelatin! I’ve tried an ocean of low carb, grain free, sugar free brownie recipes, and nothing compares to this recipe. Thanks, Carolyn. Bonus: You just changed my chocolate and peanut butter loving husband’s life, but Even though he gives me all the credit, we both know it’s all you! Thanks again! The recipe is genius!
Carolyn says
Shannan, thanks so much! I love hearing that.
Brandie says
We made these this weekend and had to report back that they are truly amazing!
Carolyn says
So glad you liked them!
Felicia says
Thank you so much for such an amazing recipe!! My husband, little boy, and I enjoyed this so much! The brownies were so moist, the peanut butter topping decadently creamy! You’re so awesome at making this ketogenic lifestyle a breeze, and the recipes are simply delicious! Keep them coming!
Madelynn says
So, I use your recipes all the time. I just tried this one. You rock! My husband said we should send you flowers for this one. I have never had a bad recipe from this site. Amazing!
Carolyn says
Aw, that’s sweet. Thanks!
Kim Pitts says
Best Brownies Ever!!! I refrigerated them and they are even better the next day! They are rich but still dangerous…I could keep eating them they are so good!
Carolyn says
So glad to hear it!
shawnna says
OOOH so good! I could tell my brownie batter was thin enough and chose not to add the water. They were perfection! The addition of the peanut butter and chocolate on top was divine! Thank you again, Carolyn – your recipes are always fantastic.
Carolyn says
So glad you liked them!
Hillary Bleiker says
These are amazing! I made these last night; they take a few steps, but are sooooooooooooooo worth it.
Carolyn says
Glad you like them!
Gina Baughn says
These have to be my favorite Keto dessert so far! Carolyn I’m so thankful for your website whenever I need a recipe I come straight here. It has saved me from wasting countless ingredients on recipes that don’t turn out. I’ve never made anything that I don’t love from your site. These brownies are Gooey and delicious my children all gobbled them up as well.
I’ve lost close to 40 pounds going low-carb. And you’ve helped to keep me on track, even with my killer Sweet tooth!
Carolyn says
So glad to hear it, Gina…and congrats on your weight loss!
Rachael Yerkes says
I may eat the entire pan!!
Katerina @ diethood .com says
WOW!! These look and sound absolutely amazing!! Can’t wait to try this recipe!!
Aimee Shugarman says
You just went and made my favorite keto brownie recipe even better!! LOVE these.
Emily Hill says
I can’t believe these are keto-friendly. They look way too decadent and unhealthy. YUM!
Krissy Allori says
Anything with peanut butter and fudge sounds good in my books!
stef says
My husband loves everything peanut butter and chocolate. He would go crazy for these!! They sound amazing.
Evan Halperin says
These taste great, though i definitely under cooked the brownies. They turned out more fudge like rather than a bit more cake like. They still taste good, they just need to cook longer and cool longer