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If you’re a peanut butter lover like me, you have to try this sugar-free keto peanut butter fudge recipe. The taste and texture is spot on, you need just a few ingredients, and you won’t be able to tell the difference at all between this and regular old-fashioned peanut butter fudge with powdered sugar.

Nobody likes gritty fudge, so using a keto powdered sweetener is so important! This recipe relies on Besti Powdered Monk Fruit Allulose Blend because it tastes just like sugar, dissolves easily into the fudge base, and clocks in at zero grams net carbs.

Why You’ll Love This Keto Peanut Butter Fudge Recipe

Sugar-Free Peanut Butter Fudge Ingredients

This section explains how to choose the best ingredients for peanut butter keto fudge, what each one does in the recipe, and substitution options. For measurements, see the recipe card below.

How To Make Keto Peanut Butter Fudge

This section shows how to make sugar-free peanut butter fudge with step-by-step photos and details about the technique. For full instructions, see the recipe card below.

Melted peanut butter, butter, and Besti in a bowl

TIP: Add toppings before chilling if you like. See variation ideas below!

Keto peanut butter fudge frozen in pan

TIP: A warm, wet knife slices more easily. Run the knife under hot water before slicing, and anytime you notice sticking.


If you prefer more classic fudge recipes, try my keto chocolate fudge, or if you like the kind made with condensed milk, I have a sugar-free version in my Easy Keto Carboholics’ Cookbook.

How Many Carbs Are In Peanut Butter Fudge?

Traditional peanut butter fudge has about 16 grams carbs per 1-inch piece. Instead, this sugar-free peanut butter fudge recipe has just 3 grams net carbs in a 2×2-inch piece (that’s 4 times the serving size!). If you cut the fudge into 1-inch pieces, each one will have less than 1 net carb.

Storage Instructions

Store the sliced keto peanut butter fudge bars in an airtight container in the freezer. Soften on the counter for a few minutes before serving. (They are also okay in the refrigerator, but will be softer and harder to handle.)

More Keto Peanut Butter Dessert Recipes

If you like this low carb peanut butter fudge recipe, you might also like some of these other keto peanut butter recipes:

Tools To Make Easy Sugar-Free Peanut Butter Fudge

Keto Peanut Butter Fudge Recipe:
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Reader Favorite Recipes

The recipe card is below! Readers that made this also viewed these recipes:

Keto Peanut Butter Fudge Recipe (4 Ingredients)

This sugar-free keto peanut butter fudge recipe is rich, fudgy, and easy to make with just 4 ingredients. Naturally gluten-free, with a dairy-free option.

Course Dessert
Keyword keto peanut butter fudge, sugar-free peanut butter fudge
Calories 193 kcal
Total Time 40 minutes
Author Maya Krampf from
Servings 16 servings (2×2″ squares)

Tap underlined ingredients to see where to get them. Please turn Safari reader mode OFF to view ingredients.

Get Keto Sweetener For This Recipe

Tap on the times in the instructions below to start a kitchen timer while you cook.

Line an 8×8 in (20×20 cm) baking pan with parchment paper, letting it hang over the sides. Set aside.

Combine the peanut butter and butter in a large bowl (if using the microwave) or saucepan (if using the stove). Heat over low heat, stirring a few times, until melted and smooth.
Stir in the sweetener and collagen powder, until smooth. Taste and adjust sweetener if needed. Remove from heat. Stir in vanilla extract.

Spread the mixture into the baking pan. Freeze for 30-45 minutes, until firm.

To slice, lift the parchment paper out of the pan and place on a cutting board. Run a knife under hot water to warm it up, dry, and use it to cut the fudge into squares. Store in the freezer. If desired, soften on the counter for a couple of minutes when serving.

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Serving size: 1 2×2″ square

This sugar-free peanut butter fudge is very filling. If you want to enjoy it as a bite size treat with fewer carbs and calories, just cut it into smaller squares.

Nutrition Facts
Amount per serving. Serving size in recipe notes above.

Nutrition facts are provided as a courtesy. Have questions about calculations or why you got a different result? Please see our nutrition policy.

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