This Low Carb Chocolate Peanut Butter Fudge is a rich, creamy, chocolatey treat that satisfies sweet cravings without all the added sugar. Made with sugar-free chocolate, natural peanut butter, butter, and a low-carb sweetener, this easy no-bake dessert is perfect for keto lifestyles, holiday treats, or an everyday chocolate fix.
The best part? You only need a handful of ingredients and a refrigerator to make these delicious fudge squares!
Recipe Details
- Prep Time: 10 minutes
- Chilling Time: 2–3 hours
- Total Time: 2 hours 10 minutes to 3 hours 10 minutes
- Servings: 16 squares
- Course: Dessert
- Cuisine: American
- Difficulty: Easy
- Diet: Low-Carb, Keto-Friendly
Ingredients
- ½ cup (128 g) natural peanut butter, unsweetened
- ½ cup (85 g) sugar-free dark chocolate chips
- ¼ cup (56 g) unsalted butter
- 2 tablespoons powdered erythritol or your preferred powdered low-carb sweetener
- 1 teaspoon vanilla extract
- ⅛ teaspoon salt, optional
- 2 tablespoons unsweetened cocoa powder, optional, for a deeper chocolate flavor
Step-by-Step Instructions
Step 1: Prepare the Pan
Line a small 8 × 4-inch loaf pan or a similar-sized container with parchment paper. Leave a little extra paper hanging over the sides so you can lift the fudge out easily after chilling.
Step 2: Melt the Chocolate and Butter
Place the sugar-free chocolate chips and butter in a microwave-safe bowl.
Microwave in 20-second intervals, stirring after each interval until the mixture is smooth and completely melted. Alternatively, melt them together in a heatproof bowl over a pan of gently simmering water.
Avoid overheating the chocolate, as it can become grainy or scorched.
Step 3: Add the Peanut Butter
Stir the unsweetened peanut butter into the melted chocolate mixture.
Mix until the ingredients are fully combined and the mixture looks glossy and creamy.
Step 4: Sweeten the Mixture
Add the powdered low-carb sweetener, vanilla extract, and salt, if using.
Stir until everything is evenly incorporated. If you want a richer chocolate flavor, add the optional unsweetened cocoa powder and mix well.
Taste the mixture and adjust the sweetness before pouring it into the pan.
Step 5: Transfer to the Pan
Pour the chocolate peanut butter mixture into the prepared pan.
Use a spatula to spread it evenly into the corners. Gently tap the pan against the counter to remove any large air pockets.
Step 6: Chill Until Firm
Place the pan in the refrigerator for 2–3 hours, or until the fudge is completely firm.
For a faster option, place it in the freezer for approximately 30–45 minutes, checking periodically to make sure it doesn’t become excessively hard.
Step 7: Slice and Serve
Lift the chilled fudge out of the pan using the parchment paper.
Place it on a cutting board and slice into 16 small squares using a sharp knife. For cleaner cuts, warm the knife slightly and wipe it dry between slices.
Serve chilled for a rich, smooth, chocolatey treat.
How to Make the Best Chocolate Peanut Butter Fudge
- Use creamy peanut butter: Smooth, unsweetened peanut butter gives the fudge a silky texture.
- Choose powdered sweetener: Powdered erythritol or a suitable powdered monk fruit blend mixes more smoothly than granulated sweetener.
- Melt slowly: Gentle heating helps prevent the chocolate from burning or separating.
- Adjust sweetness carefully: Sugar-free chocolate varies in sweetness, so taste before chilling.
- Keep it chilled: Butter and chocolate help the fudge set firmly when refrigerated.
How to Store
- Refrigerator: Store the fudge in an airtight container for up to 2 weeks.
- Freezer: Freeze the squares in a freezer-safe container for up to 3 months. Separate layers with parchment paper.
- Thawing: Let frozen fudge soften in the refrigerator before serving.
- Serving tip: Keep the fudge refrigerated until ready to eat, especially in a warm kitchen, because it softens at room temperature.
Nutrition Facts
Estimated per square, based on 16 servings. Actual values depend on the chocolate, peanut butter, and sweetener used.
| Nutrient | Amount |
|---|---|
| Calories | 105 kcal |
| Protein | 2.5 g |
| Total Fat | 10 g |
| Total Carbohydrates | 4 g |
| Fiber | 1.5 g |
| Sugar | 1 g |
| Estimated Net Carbs | 2.5 g |
Net carbs are calculated by subtracting fiber from total carbohydrates. Sugar alcohols may affect the final calculation depending on the sweetener used, so check the product labels.
Is This Recipe Keto-Friendly?
Yes! This recipe can be keto-friendly when made with unsweetened peanut butter, low-carb sweetener, and sugar-free chocolate with minimal digestible carbohydrates. Check labels carefully, because some sugar-free chocolate products contain added starches or other carbohydrates.
Peanut butter also contributes carbohydrates, so portion size matters.
Final Thoughts
This Low Carb Chocolate Peanut Butter Fudge is proof that a simple dessert can taste rich and indulgent without relying on traditional sugar. The smooth peanut butter, deep chocolate flavor, and creamy texture make every square satisfying.
It’s an excellent make-ahead dessert for busy weeks, holiday platters, or whenever a chocolate craving strikes. Keep a batch in the refrigerator or freezer so you always have a delicious low-carb treat ready to enjoy.
