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Keto Peanut Butter Cake Bars


My recipe for Keto Peanut Butter Cake Bars is full of peanut butter goodness. It’s thick, soft, and chewy in one perfect little keto-friendly treat. 

Years ago I would make a recipe similar to this for my family. Of course, back then it was one very high carb-loaded dessert. That high carb option needed a keto makeover and these easy keto peanut butter bars are the result of wanting that craving satisfied.



This girl has always enjoyed the flavor of peanut butter and if it’s slipped inside a cookie, bar, or cake then I am for sure all in. If you’re anything like me, you will appreciate the bold peanut flavor in this dessert. 

I love how this makes enough for a large crowd. But fear not, because this recipe freezes beautifully so you can certainly tuck them away in your freezer for when you want to satisfy your peanut butter cravings safely. 

This is one of those recipes you can serve your entire family. Since these low carb cake bars are so good that even those not on a keto diet will enjoy it. Don’t you just love giving your family healthy treats that they will actually ask for?

I would describe these as a cross between bars and cake. They are not exactly bars but not exactly cake either, these are more what you would call cake bars.

If what you are wanting is a true cake, then my keto peanut butter bundt cake is one you should check out. 

For a true bar experience, you might try my Keto Peanut Butter Chocolate Chip Bars and my cookies for a Keto Peanut butter cookie recipe that is unmatched. I also have a complete list of Keto Cookies that any cookie lover doing keto would enjoy exploring. 

Do check out our keto peanut butter recipes for more delicious keto-friendly peanut butter recipes!

Keto Peanut butter cake bars pin

Keto Peanut Butter Cake Bars


Keto Peanut Butter Cake Bars

Recently, I made a batch of these to have as a dessert option when I had some family drop-in wanting to test our new ping-pong table. After a few rounds of ping pong, my niece Melissa asked if I had anything sweet to eat. To which I quickly responded by pulling out my large pan of keto-friendly peanut butter bars.

Seeing so many non-keto folks around that pan was a tad intimidating but I thought what better way to test a recipe than with a group of people who rarely if ever have anything ketogenic. 

All I can say is that their ohhhs and awwws proved that it was a winning recipe. And that vote of confidence made my day. 

How To Make Keto Peanut  Butter Bars

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Keto Peanut butter cake bars unsliced

Keto Peanut Butter Cake Bars

To make these keto peanut butter cake bars you’ll need a few basic keto baking ingredients. My recipe includes creamy peanut butter, eggs, butter, almond flour, and a little whey protein.

If you do not have any whey protein available, that’s not a problem. Just substitute it for more almond flour. I told you this was a simple recipe.

You can, of course, substitute the peanut butter for your favorite nut butter and still have an amazing keto treat. See there I just gave you more options!

These keto peanut butter cake bars have a rich peanutty flavor profile thanks to the generous amount of peanut butter. But do make sure that when choosing your peanut butter, that it’s one that only has peanuts in the ingredients.

I wanted these bars to be moist and I accomplished this by using both butter and cream cheese in the batter. And as far as what flour to use to keep it low in carbs, I went with almond flour. I also added some zero-carb protein powder for stability. 

The Sugar-Substitute

keto peanut butter cake bars topped with peanuts on top

Keto peanut butter cake bars topped with peanuts

When it comes to choosing which sugar substitute to use for this recipe, I have a few options for you to choose from.

My go-to choice is Lakanto Monk Fruit because it truly is the closest thing to sugar in my book. Not only does it behave like sugar but there is barely any aftertaste. It is a monk fruit and erythritol blend. In this recipe, you can choose to use their granulated or gold option with equally great results.

Lakanto Monk Fruit gets its sweetness from antioxidants called mogrosides, instead of fructose or sucrose. It’s why it’s a great all-natural sugar substitute and has zero calories and zero glycemic index.

I’m also partial to  Swerve an erythritol blend. Unlike other natural sweeteners like stevia, it has no bitter aftertaste and measures just like sugar.

It’s also a sugar substitute that browns and caramelizes just like sugar. Swerve is made from ingredients found in select fruits and starchy root vegetables and contains no artificial ingredients, preservatives or flavors.

Swerve is the name brand of Erythritol it’s unlike other sugar alcohols has a 0 % impact on blood sugar.

You could also use the stevia and erythritol-based brand Pyure for these cake bars. But if using Pyure you will want to use 1/2 the amount called for in this recipe since it’s much sweeter.

Lastly, if you can easily find a more natural sugar substitute you can also use Splenda with great success.

You will want to use the Splenda that has a bulking agent. It’s the one that comes in larger bags. I don’t recommend Splenda Bake because it’s actually half sugar half sucralose product and will be too high in carbs to be considered keto-friendly.

Keto Peanut butter cake bars unsliced

Keto Peanut Butter Cake Bars

Keto Peanut Butter Recipes

If you love peanut butter then you also need to check out these other keto-friendly recipes.

I’m not completely sure why fall is my favorite season, especially since it’s really non-existent here in South Florida where I have lived most of my life.

Despite this, I still love everything about what the fall season represents. You know the start of a new school year, pumpkin latte, coming up with a keto peanut butter bar recipe and even the cheesy fake fall leaves in the department stores.

I did warn you that I LOVED everything about this season.

For some reason, I associate peanut butter also with the fall season. Again, maybe it has something to do with all those peanut butter and jelly sandwiches I had as a kid.

Tag Us

I sure hope you will give this recipe a try and will help us share it. If you give it a try, make sure you remember to tag us on Instagram, Facebook, and Pinterest.  It’s what keeps this girl encouraged to keep sharing and perfecting her recipes.

Also, check out our Amazon Store for our recommendations. You might be surprised by how many great keto options are at your disposal.

Join Our Jesus And Keto Movement 

If there is one thing I particularly proud of sharing it’s how we combined our Christian faith with the keto diet.   

In case you don’t know, Randy and I came to the keto diet looking at it from a Christian perspective. As believers, we live our entire lives supported by God’s grace.

So when the Holy Spirit led us to combine our Christian faith and the keto diet, we did so in hopes of finding lasting transformation.

To say we needed God’s intervention is putting it mildly. When we followed the Holy Spirit’s prompting to we got on the path to real transformation. 

Knowing firsthand the benefits of this decision we have created a closed Christian group that is using the keto diet to transform their lives.  I love how supportive and encouraging this group of believers is. It’s exciting to see how people are transforming their lives by combining this lifestyle with the Christian faith. 

The testimonies coming out of our Fittoservegroup is what motivates us to continue to share what we’ve learned. We invite you to join our Private Facebook Group and see if it’s not the key you have been missing.

Favorite Keto Hack To Stay On Track!

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Arming yourself with keto recipes is certainly key in doing this diet long enough to see the many benefits. But even with the best low carb ketogenic recipes sometimes additional help is needed. 

This is when we also encourage you to have the right supplements to help you get and stay in ketosis. Because when you have the right tools the keto diet becomes easier. 

Perhaps you’ve struggled to get into ketosis consistently on your low carb keto diet, or you’ve hit a plateau that doesn’t seem to budge, consider using Perfect KETO’s bundle to assist you.

It’s a great way to see the benefits sooner rather than later. 

You’ll learn how to elevate your ketones naturally enter into ketosis more quickly. Being at a deeper level of ketosis will help reduce your appetite, carb cravings, and give you lasting energy.  

These are the things you want to see happen as they make this diet sustainable and it’s why we recommend them. 

Perfect Keto has offered our readers a 15% discount on their products. Simply use this link for all qualifying products and the code FITTOSERVE at checkout. 


Keto Peanut butter cake bars in a white pyrex

Keto Peanut Butter Cake Bars

Yield: 24
Prep Time: 10 minutes
Cook Time: 40 minutes
Total Time: 50 minutes

A simple and delicious low carb keto peanut butter bar recipe.



  1. Preheat oven to 350 degrees
  2. Grease a 9X13 inch pan.
  3. In a large bowl using an electric mixer combine the softened butter, sugar substitute, vanilla extract, and cream cheese.
  4. Once well combined and light and fluffy add the sour cream and peanut butter.
  5. Next, add the eggs one at a time until fully incorporated.
  6. To this batter add the almond flour, whey protein, baking powder, and salt.
  7. Lastly, sprinkle the 1/2 cup of peanuts over the batter and sea salt flakes.
  8. Bake at 350 degrees for 40-45 minutes or until an inserted toothpick comes out clean.
  9. Allow the bars to cool on a baking rack for 20 minutes.
  10. While the bars are cooling melt the 1/4 cup of peanut butter to drizzle on the top of the bars. I do so in the microwave in 20-second intervals.
  11. Drizzle the top of the bars with the melted peanut butter and allow the bars to set another 10 minutes before slicing.
  12. Store leftovers in the refrigerator for up to 5 days or freeze for up to 3 weeks.


For more of a bar, option place these in the refrigerator for 30 minutes to firm up before slicing.

Nutrition Information:
Yield: 24 Serving Size: 1
Amount Per Serving: Calories: 250Total Fat: 23.3gSaturated Fat: 9.9gCholesterol: 71mgSodium: 165mgCarbohydrates: 5.5gNet Carbohydrates: 5.1gFiber: 1.4gSugar: 1.4gProtein: 7.9g

Did you make this recipe?

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Thursday 9th of September 2021

I must try these low-carb peanut butter bars! they look yummy and healthy. Thanks for sharing the recipe.

Hilda Solares

Wednesday 15th of September 2021

Can't wait till you do Mark! Enjoy in good health.

Lynda Schneider

Thursday 18th of June 2020

I particularly like using Allulose when baking, how much would you suggest. It is like 1 1/3 : 1 of sugar. Also, you could use when and almond flour together? How much of each? Thank you..these sound delicious!

Hilda Solares

Friday 19th of June 2020

Hi Lynda, Allulose is a great option but like you stated it's a little less sweet. The suggestion of using 1 1/3 cup for 1:1 is great. I'm a little confused about the second half of your question. If you could clarify I would be happy to address too.


Wednesday 9th of October 2019

I love peanut butter so can't wait to try these. Thank you for sharing. God bless and listen for the trumpet because Jesus is coming soon.

Hilda Solares

Wednesday 9th of October 2019

Yay Violet! Glad you found our recipe. Maranatha!


Monday 16th of September 2019

Shalom from California! I can’t wait to try this Peanut Butter Extravaganza... it looks like a new fav for me. I would also like to make it for my Keto girlfriend who has a peanut allergy, substituting almond butter and sliced almonds with the melted almond butter drizzle on top.... What do you think? It seems as though that would work out just fine, right? Blessings❣️


Monday 16th of August 2021

@Lynette, your friend would also be allergic to all other tree nuts so substitutions wouldn't work.

Hilda Solares

Tuesday 17th of September 2019

Hi Lynette, I think using almond butter is a great option for your friend. Let us know once you try. Blessings to you too.


Saturday 12th of January 2019

Hi how much vanilla extract and when?

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