Keto Peanut Butter Fat Bombs Fudge

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When you have sweet cravings on a keto diet, reach for one of these peanut butter fat bombs for a satisfying snack or dessert. The silky smooth texture of these bites melt in your mouth like fudge.

peanut butter fat bombs recipe

When moving to a ketogenic diet, the sugar cravings can get really strong. Thankfully, there are a lot of sugar free treats you can make to satisfy your sweet tooth.

Keto fat bombs are a perfect snack for those just getting started on the low carb lifestyle. That’s because they are a delicious high fat treats with minimal net carbs so they don’t impact blood sugar.

If you need to get some extra fat or just crave something sweet, make a big batch of these simple peanut butter fat bombs. They taste good and don’t take much time to prepare.


There’s a lot of flexibility when it comes to the ingredients so you can easily substitute something you have on hand if needed. You only need a handful of low carb staples to make the recipe.

Peanut butter

You obviously need peanut butter to get the flavor needed. But other seed or nut butters work well too. If you have a peanut allergy, try using almond butter instead. Or make it with sunflower seed butter if you want them nut and peanut free.

Be sure to use a natural peanut butter with no sugar added. A creamy peanut butter is best to get a smooth texture.

Keto Sweetener

I like to blend my own individual sweeteners, but you can use a pre-made blend instead. The most common blends use erythritol but I find allulose gives a better texture as erythritol can crystallize and give a grainy texture. There are allulose blends available that combine the sweetener with either stevia or monkfruit or both.


A bland unsweetened powder is needed to firm up the fat bombs. I used collagen but you can use another unflavored protein powder instead. Heavy cream powder or coconut cream powder are great alternatives too.


Using real butter gives a nice buttery flavor. But if you want to make these dairy free, you can substitute in coconut oil. They even make a butter flavored coconut oil.

Almond milk

If you want a firmer peanut butter fat bombs, you can use less almond milk. It’s used to give a smoother texture. You can use coconut milk or heavy cream instead.

Note: You’ll find the full list of ingredients with the amounts used in the printable recipe card further down.

ingredients for peanut butter fat bombs recipe


Once you have all your ingredients together, you just need to combine them over medium heat so they are well combined.

It should only take a few minutes for the butter and peanut butter to melt down. That’s when the mixture should begin to come together.

cooking peanut butter mix in pot

Continue stirring over medium heat. The cooking is done when mixture darkens up and becomes shiny. At this time you’ll want to remove it from the heat. Then you can stir in the optional vanilla extract which will enhance the flavor and add sweetness without any additional sweetener.

final cooking of peanut butter fat bomb mixture

The mixture will start to harden as it cools so spread it into a parchment paper lined pan right away using a rubber spatula. Allow it to cool slightly at room temperature and then place it in the refrigerator to cool completely.

peanut butter mixture in lined square pan

Once the peanut butter mixture has set and the peanut butter fat bombs are firm, you can lift them out of the pan on the parchment paper and cut into squares. They will get soft at room temperature so keep them stored in an airtight container in the refrigerator or freezer.

fat bomb slice on spatula

Quick tips

  • Use your preferred sweetener. The recipe needs about 1 cup of sugar substitute but you can adjust the sweetness to taste. If you need help adjusting different sweeteners, use an online sweetener conversion calculator.
  • Make it nut or peanut free. The creamy peanut butter can easily be swapped with nut butters or seed butters. Try different flavors like hazelnut butter or SunButter.
  • Change the powder up. Collagen and other protein powders can be pricey. You could try using an unsweetened peanut powder, heavy cream powder, or coconut milk powder.
  • Add chocolate. You can roll the cooled mixture into balls, freeze to harden, and then dip in chocolate. Or try adding chocolate over the peanut butter layer by spreading melted chocolate chips on top. It will taste just like a Reeses Peanut Butter Cup!

Serving suggestions

Once cut into slices, these sweet bites are eaten like fudge. Just watch your serving size as they are very calorie dense.

The peanut butter fat bomb squares can get sticky when left out at room temperature. If you want to serve them to others, you can can them into smaller pieces and serve with toothpicks to pick them up. Another idea is to freeze them to dunk into a chocolate fondue.

peanut butter fat bombs cut in squares on white plate


Before getting to the recipe, I wanted to address some of the questions people often have about fat bombs.

How many fat bombs can you have on keto?

Just like everything else, you don’t want to overdo it. Although you could have up to three a day, it’s best to stick to just one or two.

Do fat bombs really work?

Fat bombs were created to help people meet the optimum amount of fat on a ketogenic diet. Since they are loaded with healthy fat, eating just a couple a day along with low-carb meals should help meet the daily fat intake.

Is peanut butter good fat for keto?

Although peanuts are legumes, they are more like nuts and are low in carbs. The fat in peanut butter comes from monounstaturated and polyunsaturated acids which are considered good fats.

How many fat bombs is a serving?

The amount made in the recipe is for 16 servings assuming that it’s cut into 16 equal size squares. The nutritional data is based on a one square serving which contains just 3g total carbs.

stack of slices with top one bitten

Related recipes

If you’re looking for more easy recipes to satisfy your sweet tooth on keto, be sure to check out a few of our other low-carb treats.

square peanut butter fat bombs on white plate
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5 from 3 votes

Keto Peanut Butter Fat Bombs Fudge

A creamy peanut butter fudge made with peanut butter, protein powder, dry milk, butter and almond milk. Sweetened with a mix of low carb sweeteners.
Course Dessert
Cuisine American
Keyword keto fudge, peanut butter fudge
Prep Time 10 minutes
Cook Time 10 minutes
Total Time 20 minutes
Servings 16
Calories 179kcal


  • cups allulose
  • ¼ teaspoon stevia concentrated powder
  • 1 cup natural peanut butter no sugar added
  • 1 ½ cup collagen or heavy cream powder
  • ¼ cup butter
  • ½ cup unsweetened almond milk or vanilla unsweetened almond milk
  • 1 teaspoon vanilla extract optional


  • Stir together allulose, stevia, peanut butter, collagen (or cream powder), butter, and almond milk in medium saucepan over medium heat. Continue to cook and stir until the butter has melted. Remove from heat and stir in vanilla extract if using.
  • Quickly transfer to a wax paper lined 8×8 dish. The fudge will begin to harden quickly. When cooled completely, cut into slices. Keep refrigerated in airtight container.


4g net carbs per serving


Calories: 179kcal | Carbohydrates: 3g | Protein: 24g | Fat: 8g | Saturated Fat: 2g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 4g | Cholesterol: 1mg | Sodium: 155mg | Potassium: 110mg | Fiber: 1g | Sugar: 2g | Vitamin A: 6IU | Calcium: 21mg | Iron: 1mg

  1. 5 stars
    Love this recipe! It really hits the spot. Funny question maybe, but so I can make one version for my non-Keto kids, do you know if you could make this recipe with regular sweetener in place of allulose? 🤦‍♀️ Thank you!

  2. Can you help me?! I’m fairly new to keto desserts. I have many ingredients, but not enough knowledge to know if I have 2 completely different products or 2 of the same thing just labeled differently. I have one canister of Vital Proteins brand original collagen peptides. I also have a canister of Ancient Nutrition Multi Collagen Protein. Is there a difference between collagen peptides and collagen protein? If so, which do I use in this recipe that calls for collagen powder?

  3. I’m new to the keto diet. Confused on net carbs. I thought that was calculated by # of carbs-# of fiber-# of sugar alcohol. With that formula and the nutrition information above I get 2 net carbs, not the 4 showing on the recipe.


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