Sugar-Free Peanut Butter Fudge Ingredients
Here I explain 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.
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Peanut Butter – Make sure it’s salted and has no added sugar (check labels!). Also, for the fudge to set, it’s important that it’s the thick, creamy kind, not the runny kind. Many brands labeled “natural peanut butter” are too runny for this recipe. I like this brand, which is thick and creamy. Butter – I prefer grass fed butter for best flavor and nutrition, but you can use any unsalted butter. If you use an unsalted peanut butter, then your butter should be salted instead. Besti Powdered Monk Fruit Allulose Blend – Not only does it taste and act like powdered sugar, it also dissolves easily (unlike other keto sweeteners), for a completely smooth fudge texture. If you have to replace this with a different sweetener, make sure it’s powdered, but keep in mind that powdered erythritol based sweeteners (including most other brands of stevia and monk fruit) may crystallize when storing and create a gritty texture. Protein Powder – I used collagen (this brand is great!), but any neutral protein powder should work for sugar-free peanut butter fudge. Be sure it’s unsweetened. Vanilla Extract – Optional, but recommended for flavor. You can also use different extracts here to change it up.
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, to help you visualize it. For full instructions, including amounts and temperatures, see the recipe card below.
Prep the pan. Line an 8×8 pan with parchment paper or wax paper, letting the paper hang over the sides. Melt peanut butter and butter. In a large mixing bowl, heat peanut butter and butter in the microwave, or in a sauce pan on the stove over low to medium heat, until melted.
Mix keto friendly peanut butter fudge. Stir in Besti Monk Fruit Allulose Blend and collagen powder, until smooth. Taste and adjust sweetener to taste. Remove from heat and stir in vanilla. Freeze. Pour the mixture into the lined pan and freeze until firm. (You can also chill in the fridge instead, but the fudge will be more soft.)
TIP: Add toppings before chilling if you like. See variation ideas below!
Slice. Lift the parchment paper out of pan and place fudge onto a cutting board. Slice into squares.
Flavor Variations
Double peanut – Sprinkle some chopped peanuts over the top, or fold into the batter. Chocolate chip – Fold sugar-free dark chocolate chips into the batter before chilling, or simply sprinkle on top. Buckeye – After making the peanut butter layer, make keto chocolate fudge and pour that over the peanut butter before chilling. (You can also make individual keto buckeyes like this instead.) White chocolate – Melt 1/2 cup sugar-free white chocolate chips and stir into the fudge batter. Maple walnut – Replace 2-3 tablespoons of the peanut butter with keto maple syrup. Add 2-3 more tablespoons of collagen and 1/3 cup chopped walnuts. Sea salt – Sprinkle flaky sea salt over the fudge before freezing.
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. Run the knife under hot water before slicing, and anytime you notice sticking.
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:
Keto Chocolate Peanut Butter Cheesecake Chocolate Peanut Butter Fat Bombs Keto Peanut Butter Pie Sugar-Free Peanut Butter Cups Keto Peanut Butter Cookies
Please enter your first name for your account. Your saved recipe will also be sent to your email. 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.
