Keto Peanut Butter Fudge
Rich, melt-in-your-mouth keto peanut butter fudge with just 2.1g net carbs per square. Ready in 15 minutes of hands-on work (plus chilling), this no-bake treat delivers creamy peanut butter flavor and 11g of fat to satisfy cravings without the sugar.
Head of Nutrition · June 17, 2026
Nutrition per serving
Per serving · makes 16. Values are estimates; brands vary.
This creamy keto peanut butter fudge comes together in one saucepan with no baking and no sugar. It is the kind of low-carb treat you can keep in the fridge for whenever a sweet craving hits, at just over 2 grams of net carbs per square.
Ingredients
- 1 cup natural unsweetened peanut butter (smooth, no added sugar)
- 1/2 cup unsalted butter
- 1/3 cup powdered erythritol or monk fruit sweetener
- 1/4 cup coconut oil
- 1 teaspoon pure vanilla extract
- 1/4 teaspoon fine sea salt (omit if peanut butter is salted)
- 2 tablespoons sugar-free dark chocolate chips, for drizzle (optional)
Instructions
- 1
Line an 8x8-inch baking dish with parchment paper, leaving an overhang on two sides so you can lift the fudge out later.
- 2
In a medium saucepan over low heat, combine the peanut butter, butter, and coconut oil. Stir constantly until fully melted and smooth, about 3 to 4 minutes. Do not let it simmer.
- 3
Remove from heat and whisk in the powdered erythritol, vanilla, and salt until the sweetener fully dissolves and the mixture is glossy and uniform.
- 4
Pour the mixture into the lined dish and smooth the top with a spatula. If using, melt the chocolate chips and drizzle over the top, then swirl with a toothpick.
- 5
Refrigerate at least 2 hours, or until completely firm. Lift out using the parchment overhang and cut into 16 squares with a sharp knife.
Tips & notes
- Use a powdered (confectioners-style) sweetener rather than granulated to avoid a gritty texture. If you only have granulated erythritol, blitz it in a spice grinder first.
- Store in an airtight container in the refrigerator for up to 2 weeks, or freeze for up to 3 months. The fudge softens at room temperature because of the coconut oil, so serve it chilled.
- Swap peanut butter for almond or sunflower seed butter for a nut-free or different flavor; net carbs stay similar with unsweetened varieties.
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Frequently asked questions
- How many carbs are in keto peanut butter fudge?
- Each of the 16 squares has 2.1g net carbs (3.6g total carbs minus 1.5g fiber), along with 142 calories, 4.2g protein, and 13.1g fat. The recipe makes 16 squares total.
- Why is my keto fudge soft or melty at room temperature?
- Coconut oil and natural peanut butter both soften quickly out of the fridge. Keep the fudge refrigerated until serving, and it will hold a firm, sliceable texture. For a sturdier square, reduce the coconut oil to 2 tablespoons.
- Can I make this dairy-free?
- Yes. Replace the unsalted butter with an equal amount of additional coconut oil or a firm vegan butter. The texture will be slightly softer, so chill it a bit longer and keep it cold.
