High-Protein Peanut Butter Fudge
High-Protein Peanut Butter Fudge
Creamy, rich peanut butter fudge with a protein boost — low-carb, sugar-free, and ready in 40 minutes
This high-protein peanut butter fudge is smooth, rich, and perfectly sweet without the sugar. Peanut butter, protein powder, and a touch of cream create a classic fudge texture that sets firm and slices cleanly. Every piece delivers 6 g of protein and only 3 g net carbs.
Low-carb, sugar-free, and perfect for a make-ahead treat or snack.
Why you’ll love this fudge
- 6g protein per piece — a high-protein treat
- Only 3g net carbs and fully sugar-free
- Creamy, rich peanut butter flavor
- No-bake and ready in about 40 minutes
- Sets firm and slices cleanly
- Great for meal prep or snacking
Health notes
- High protein: Protein powder boosts every piece.
- Low carb: No sugar or traditional thickeners.
- Sugar-free: Powdered sweetener keeps the carbs low.
- Simple: Melt, mix, chill, and slice.
Key element — don’t overheat
Melt the peanut butter and butter gently. High heat can make the mixture oily or cause the protein powder to seize.
Ingredients
Fudge
- 1 cup natural peanut butter (no sugar added)
- ¼ cup butter or coconut oil
- ⅓ cup vanilla or unflavored protein powder
- ⅓ cup powdered sugar-free sweetener
- 2–3 Tbsp heavy cream or unsweetened almond milk
- 1 tsp vanilla extract
- Pinch of salt
Optional add-ins
- Sugar-free chocolate chips
- Chopped peanuts
- Pinch of cinnamon
Swaps
- Higher protein: Add an extra tablespoon of protein powder and a splash more cream if needed.
- Dairy-free: Use coconut oil and coconut cream.
- Almond butter: Swap peanut butter for almond butter if preferred.
- Chocolate swirl: Melt a little sugar-free chocolate and swirl on top before chilling.
Instructions
| 1 | Prep the pan. Line an 8×8-inch pan with parchment paper, leaving an overhang for easy removal. |
| 2 | Melt the base. In a saucepan over low heat (or in the microwave in short bursts), melt the peanut butter and butter together until smooth. Remove from heat. |
| 3 | Add the dry ingredients. Stir in the protein powder, powdered sweetener, vanilla, and salt until fully combined. Add the cream a little at a time until the mixture is smooth and thick but still pourable. |
| 4 | Set and chill. Pour the mixture into the prepared pan and smooth the top. Refrigerate at least 30 minutes (or freeze 15–20 minutes) until firm. |
| 5 | Slice and serve. Lift the fudge out using the parchment. Cut into 16 pieces with a sharp knife. Store in the refrigerator. |
Pro tips
- Use a natural peanut butter that is well stirred — no added sugar.
- If the mixture is too thick, add a splash more cream. If too soft, add a bit more protein powder.
- Chill fully before slicing for the cleanest cuts.
- A warm knife makes neater slices.
- Keep the fudge refrigerated so it stays firm.
Nutrition
| Nutrient | Per piece |
|---|---|
| Calories | 120 |
| Protein | 6g |
| Net carbohydrates | 3g |
| Total carbohydrates | 5g |
| Fiber | 2g |
| Total fat | 9g |
| Sodium | 60mg |
Estimates based on natural peanut butter, protein powder, and butter. Exact numbers vary with protein powder brand and peanut butter type.
Variations
Chocolate peanut butter
Stir in 2 Tbsp cocoa powder or swirl melted sugar-free chocolate on top.
Crunchy
Fold in chopped peanuts or sugar-free chocolate chips before chilling.
Salted
Sprinkle a pinch of flaky salt on top before the fudge sets.
Mini bites
Press the mixture into a silicone mini muffin tray for individual portions.
Storage
| Method | Time | Notes |
|---|---|---|
| Refrigerator | Up to 1 week | Keep in an airtight container |
| Freezer | Up to 2 months | Freeze in a single layer, then transfer to a bag |
| Room temperature | Not recommended | The fudge softens quickly |
FAQ
Test your knowledge
5 quick questions about this peanut butter fudge
1. Protein per piece?
2. Net carbs per piece?
3. Why melt the peanut butter gently?
4. About how long does this take?
5. Best way to store leftovers?
