These Low-Carb Peanut Butter Cookie Bars boast loads of peanut flavor in a bar cookie. They are like brownies with a chewy middle, but taste like peanut butter instead of chocolate. These cookies can be part of a low-carb, keto, Atkins, gluten-free, grain-free, or dairy-free diet. 

Peanut Butter Cookies served on a plate

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The recipe for Low-Carb Peanut Butter Cookie Bars

Love peanut butter cookies? Then this recipe is for you! These bar cookies are loaded with peanut flavor and have a chewy consistency, like a brownie or blondie. 


This recipe is fast and easy to make. It only takes a few minutes to get them in the oven. These bars will be ready in less than half an hour. 


The inspiration

I’ve always loved peanut butter cookies and wanted to try to make them in a pan for the blog. I’ve always loved the ease of making bar cookies.


For the recipe, I used my recipe for keto-friendly skillet blondies as a starting point. 


Overhead shot of peanut butter cookies.


What to serve with Low-Carb Peanut Butter Cookie Bars

These cookies are wonderful by themselves, or with a cup of tea or coffee. Those who love the combination of chocolate and peanut butter might want to try them with hot chocolate.


I love these cookies warm from the oven, but they are also good at room temperature or even chilled.


If you’re in the mood for a more luxurious dessert, You can add a scoop of keto-friendly vanilla ice cream or even some low-carb hot fudge sauce on top.


Peanut butter cookies served with ice cream and hot fudge.


Is peanut butter keto-friendly?

Some people out there are really confused about peanut butter. I think that some of the confusion comes from the fact that peanuts are a legume, rather than a nut. 


Legumes are excluded from a Paleo diet, but not necessarily from a ketogenic diet.


Some legumes, such as many varieties of beans, have a lot of carbs in them. Peanuts are low enough in carbs that they can be eaten in fairly small amounts without kicking someone out of ketosis. 


Some people avoid peanuts because they find that legumes make their inflammation worse. If that’s you, then this recipe isn’t for you. 


What peanut butter is best on a keto diet?

There are loads of brands of peanut butter out there! They are definitely not equal. 


Many kinds of peanut butter are absolutely loaded with sugar and I try to avoid these. I also try to avoid any that contain artificial sweeteners, such as Splenda. 


What I look for when choosing a peanut butter is for an ingredient list that contains peanuts and salt. I’m also okay with it if it contains palm oil which makes the peanut butter a “no stir”. I’m a little bit lazy and this makes it a lot more convenient.


I do avoid those peanut butters that contain shortening, artificially hydrogenated or partially hydrogenated oils. Companies add these fats to keep the peanuts and the oil from separating, but I’m concerned about these artificial fats from a health standpoint. I may be lazy, but I’m not THAT lazy!


You can even make your own peanut butter! Check out this recipe for peanut butter from Ketogasm.


Low-Carb Peanut Butter Bars--bite shot


How long do I bake peanut butter cookies?

These bar cookies will change in consistency depending on how long you bake them. If you bake them toward the lower side of the time range, you will find that the centers are more chewy. 


If you bake them on the higher end of the range, they will be more cake-like. 


I like to take them out just as the edges are getting brown and the top is just beginning to get some color. If you bake them toward the lower end of the range, you will want to allow them to cool a few minutes before cutting them.


Final Words

These peanut butter bars are sure to satisfy a craving for peanut butter. They are very packable and perfect to take on a road trip with you.


If you love bar cookies, you might also want to try these keto magic bars from Real Balanced, our recipe for Low-Carb Pumpkin Pecan Bars, or our recipe for Easy Keto Chocolate Fudge Brownies



Overhead shot of slices of peanut butter cookie bars.
5 from 11 votes

Low-Carb Peanut Butter Cookie Bars

These Low-Carb Peanut Butter Cookie Bars boast loads of peanut flavor in a bar cookie. They are like brownies with a chewy middle, but taste like peanut butter instead of chocolate. These cookies can be part of a low-carb, keto, Atkins, gluten-free, grain-free, or dairy-free diet. 

Course Dessert, Snack
Cuisine American, low-carb
Keyword keto peanut butter cookies, low carb peanut butter blondies, low carb peanut butter cookes
Prep Time 10 minutes
Cook Time 17 minutes
Total Time 27 minutes
Servings 12 bars
Calories 136 kcal
Author Annissa Slusher



  1. Preheat oven to 350º Fahrenheit. Spray an 8"X8" baking dish with coconut oil.

    Greased pan.
  2. In a medium mixing bowl, whisk together the almond flour, granulated stevia/erythritol blend, baking soda, and sea salt. Set aside.

    Mixing the dry ingredients.
  3. In a small mixing bowl, whisk together the peanut butter and one of the eggs. When mixture is smooth, whisk in the second egg and the vanilla extract.

    Mixing the peanut butter and the eggs
  4. Stir the peanut butter mixture into the dry ingredients.

    Combining the wet and dry ingredients.
  5. Transfer mixture to the prepared baking dish. Spread evenly.

    Spreading dough in the pan.
  6. Bake in the preheated oven for 17-20 minutes. The bars will be more chewy at the lower end of this time range and more cake-like at the upper end of the range.

    Baked bars.
Nutrition Facts
Low-Carb Peanut Butter Cookie Bars
Amount Per Serving (1 bar)
Calories 136 Calories from Fat 99
% Daily Value*
Fat 11g17%
Saturated Fat 2g13%
Trans Fat 0g
Polyunsaturated Fat 1g
Monounsaturated Fat 3g
Cholesterol 31mg10%
Sodium 81mg4%
Potassium 74mg2%
Carbohydrates 3g1%
Fiber 2g8%
Sugar 1g1%
Protein 6g12%
Vitamin A 1%0%
Vitamin C 0%0%
Calcium 3%0%
Iron 3%17%
Net Carbs 1g
* Percent Daily Values are based on a 2000 calorie diet.