If you’re craving something rich, creamy, and chocolatey while following a keto lifestyle, this Thermomix Keto Chocolate Peanut Butter Fudge is the perfect homemade treat. Made with simple low-carb ingredients, this fudge has an incredibly smooth texture, intense chocolate flavour, and just the right amount of peanut butter goodness. The Thermomix does all the hard work, melting and mixing everything into a silky mixture in just a few minutes.

Unlike traditional fudge that’s loaded with sugar and condensed milk, this keto version uses sugar-free chocolate, natural peanut butter, butter, coconut oil, and a keto-friendly sweetener. The result is a delicious dessert that’s low in carbohydrates while still tasting indulgent enough to satisfy even the strongest sweet tooth.

Whether you’re looking for a quick keto dessert, a make-ahead snack, or a homemade edible gift, this recipe is easy enough for beginners and impressive enough to share with family and friends.

Why You’ll Love This Recipe

• Ready with only a few simple ingredients.
• Perfect for keto and low-carb lifestyles.
• No condensed milk or refined sugar.
• Rich chocolate flavour with creamy peanut butter.
• Made entirely in the Thermomix.
• Freezer-friendly for meal prep.
• Naturally gluten-free.
• Great for holiday dessert trays and homemade gifts.
• Easily customised with nuts or sugar-free toppings.
• Stores well for weeks.

Preparation Time

• Prep Time: 10 minutes
• Cooking Time: 5 minutes
• Chilling Time: 2–3 hours
• Total Time: About 3 hours 15 minutes

Yield: 24 pieces

Ingredients

• 200 g sugar-free dark chocolate (70–90% cocoa), broken into pieces
• 180 g natural smooth peanut butter (unsweetened)
• 80 g unsalted butter, cubed
• 60 g coconut oil
• 60 g powdered erythritol or powdered monk fruit sweetener
• 2 tablespoons unsweetened cocoa powder
• 1 teaspoon vanilla extract
• ¼ teaspoon fine sea salt
• 2 tablespoons chopped roasted peanuts (optional)
• Flaky sea salt for garnish (optional)

Equipment

• Thermomix TM5 or TM6
• Silicone spatula
• 20 cm (8-inch) square pan or loaf tin
• Baking paper
• Sharp knife
• Airtight storage container

Instructions

Step 1: Prepare the Pan

Line an 8-inch square baking pan or loaf tin with baking paper. Leave some overhang on the sides so you can easily lift the fudge out after it has set.

Step 2: Chop the Chocolate

Place the sugar-free chocolate into the Thermomix bowl.

Mix:

10 seconds / Speed 8

The chocolate should become finely chopped.

Step 3: Melt the Base

Add:

• Butter
• Coconut oil

Cook:

4 minutes / 50°C / Speed 2

The mixture should become completely smooth.

Step 4: Add Remaining Ingredients

Add:

• Peanut butter
• Powdered sweetener
• Cocoa powder
• Vanilla extract
• Sea salt

Mix:

30 seconds / Speed 4

Scrape down the bowl.

Mix again:

20 seconds / Speed 4

The mixture should now look glossy, thick, and silky.

Step 5: Add Optional Crunch

If you’d like extra texture, stir in the chopped roasted peanuts using the spatula.

This step is optional but adds a delicious crunch.

Step 6: Pour into the Pan

Pour the fudge mixture into the prepared pan.

Spread evenly using the spatula.

Tap the pan gently on the counter to remove any air bubbles.

Step 7: Garnish

Sprinkle the top with:

• Flaky sea salt
• Chopped peanuts
• Extra grated sugar-free chocolate (optional)

Step 8: Chill

Place the pan into the refrigerator.

Chill for 2–3 hours until completely firm.

For faster setting, place it in the freezer for about 45 minutes.

Step 9: Slice

Lift the fudge from the pan.

Using a sharp knife, cut into 24 bite-sized squares.

For clean cuts, wipe the knife between slices.

Tips for Perfect Keto Fudge

Use Powdered Sweetener

Granulated sweeteners can leave a gritty texture. Powdered erythritol creates a much smoother fudge.

Choose Good Chocolate

Use a high-quality sugar-free chocolate containing at least 70% cocoa for the richest flavour.

Natural Peanut Butter Works Best

Choose peanut butter with only peanuts and salt. Avoid products containing added sugar or vegetable oils.

Don’t Overheat

Heating chocolate too much can cause it to seize. Keep the Thermomix at 50°C for a silky consistency.

Chill Completely

Allow enough chilling time before slicing. This gives the fudge the perfect firm texture.

Variations

Double Chocolate

Add:

• 50 g sugar-free chocolate chips

Fold them in after mixing.

Crunchy Peanut Butter

Replace smooth peanut butter with crunchy peanut butter for extra texture.

Almond Butter Version

Swap peanut butter for almond butter for a slightly sweeter nutty flavour.

Hazelnut Chocolate

Mix in:

• 40 g chopped roasted hazelnuts

Coconut Chocolate

Add:

• 40 g unsweetened shredded coconut

Espresso Chocolate

Mix in:

• 1 teaspoon instant espresso powder

Chocolate and coffee make an amazing combination.

Salted Caramel Style

Add a little caramel extract and sprinkle generously with flaky sea salt.

Storage

Refrigerator

Store in an airtight container for up to 2 weeks.

Freezer

Freeze for up to 3 months.

Separate layers using baking paper to prevent sticking.

Serving Ideas

This rich keto fudge pairs perfectly with:

• Black coffee
• Espresso
• Keto hot chocolate
• Unsweetened almond milk
• Whipped cream
• Vanilla keto ice cream
• Fresh raspberries
• Strawberries
• Mixed nuts
• Cheese boards for a sweet-and-savoury contrast

Common Mistakes to Avoid

Using Sweetened Peanut Butter

Added sugar increases the carbohydrate content and changes the texture.

Using Granulated Sweetener

Granulated sweetener may not dissolve completely, leaving the fudge grainy.

Skipping the Coconut Oil

Coconut oil helps create a softer, creamier texture.

Overheating the Chocolate

Chocolate can become thick or seize if overheated. Stick to the recommended temperature.

Cutting Too Soon

Warm fudge is difficult to slice neatly. Always chill until fully firm.

Keto-Friendly Ingredient Guide

Sugar-Free Dark Chocolate: Provides rich chocolate flavour without the added sugar found in traditional chocolate.

Natural Peanut Butter: Supplies healthy fats and protein while keeping carbohydrates relatively low.

Butter: Adds richness and contributes to the smooth, melt-in-your-mouth texture.

Coconut Oil: Helps the fudge set properly and gives it a silky consistency.

Powdered Erythritol or Monk Fruit Sweetener: Sweetens the fudge without significantly affecting blood sugar levels, making it ideal for low-carb diets.

Unsweetened Cocoa Powder: Intensifies the chocolate flavour while adding very few carbohydrates.

Nutritional Benefits

Compared with classic fudge, this keto version is:

• Lower in carbohydrates
• Higher in healthy fats
• Gluten-free
• Grain-free
• No refined sugar
• Suitable for ketogenic and low-carb eating plans
• Rich in antioxidants from dark chocolate and cocoa
• A satisfying dessert that can help curb sweet cravings

Approximate Nutrition (Per Piece)

Makes 24 servings.

• Calories: 145
• Fat: 14 g
• Protein: 4 g
• Total Carbohydrates: 5 g
• Fibre: 3 g
• Net Carbohydrates: 2 g
• Sugar: Less than 1 g
• Sodium: 60 mg

Nutritional values are estimates and may vary depending on the specific brands of ingredients used.

Frequently Asked Questions

Is this recipe really keto?

Yes. It uses sugar-free chocolate and a keto-approved sweetener, making it suitable for most ketogenic diets when enjoyed in moderation.

Can I make this without a Thermomix?

Absolutely. You can melt the ingredients gently in a saucepan over low heat, stirring continuously until smooth, then follow the same chilling instructions.

Can I use almond butter instead of peanut butter?

Yes. Almond butter, cashew butter (if it fits your carb goals), or sunflower seed butter are excellent substitutes and will each give the fudge a slightly different flavour.

Why is my fudge too soft?

This usually happens if the mixture wasn’t chilled long enough or if too much coconut oil was added. Refrigerate for an additional hour until firm.

Can I freeze the fudge?

Yes. Freeze it in an airtight container with baking paper between the layers for up to three months. Thaw in the refrigerator or at room temperature for a few minutes before serving.

Is this recipe gluten-free?

Yes. All the ingredients are naturally gluten-free, but always check labels to ensure there is no cross-contamination if you have coeliac disease or severe gluten sensitivity.

Final Thoughts

This Thermomix Keto Chocolate Peanut Butter Fudge is everything you want in a homemade low-carb dessert—rich, creamy, intensely chocolatey, and incredibly easy to make. With just a handful of wholesome ingredients and a few minutes of Thermomix preparation, you can create a decadent treat that fits perfectly into a ketogenic lifestyle without sacrificing flavour. Whether you’re preparing snacks for the week, serving guests, or satisfying a late-night chocolate craving, this foolproof recipe delivers delicious results every time. Keep a batch in your refrigerator or freezer, and you’ll always have a satisfying keto-friendly dessert ready whenever you need it.