Cast Iron Keto
menu icon
subscribe
search icon
×

Keto Chocolate Peanut Butter Swirl Fudge

Dom Lorenzo
by
Updated:
Leave a Comment
Not yet rated

Jump to Recipe Print Recipe

This Keto Chocolate Peanut Butter Swirl Fudge is a rich, creamy, and satisfying low-carb treat that combines the best of both worlds—smooth chocolate and nutty peanut butter. With simple ingredients and a straightforward process, you can whip up this sugar-free fudge in no time. Perfect for an after-dinner dessert or a midday snack, this keto-friendly fudge will satisfy your sweet tooth without kicking you out of ketosis.

Keto Chocolate Peanut Butter Swirl Fudge cut into cubes and rectangles ready to be served.
Jump to:

Preparation Overview

Making this keto fudge is quick and easy. The process involves melting chocolate and peanut butter separately, layering them in a loaf pan, and swirling them together for that signature marbled effect. After chilling in the fridge, you'll have a batch of decadent fudge ready to enjoy.

Chef's note

Feel free to switch up the nut butter—almond, cashew, or even sunflower seed butter work great if you’re avoiding peanuts. For a crunchier texture, stir in chopped nuts or sugar-free chocolate chunks before swirling. You can also add a dash of cinnamon or espresso powder to the chocolate layer for an extra flavor boost.

Join the email list

Loading...

Thank You for Subscribing.

  • Prep Time: 10 minutes
  • Melting Time: 5 minutes
  • Chilling Time: 1 hour
  • Total Time: 1 Hour 15 Minutes
  • Difficulty Level: Easy
  • Recipe Makes 12 Servings

Ingredients for This Keto Chocolate Peanut Butter Swirl Fudge

  • 1 cup sugar-free chocolate chips
  • ½ cup heavy whipping cream
  • ¼ cup unsalted butter
  • ¼ cup powdered erythritol
  • ½ teaspoon vanilla extract
  • ½ cup natural peanut butter (unsweetened, smooth or crunchy)
  • 1 tablespoon coconut oil
  • Pinch of salt

Ingredient Substitutions

  • Chocolate chips: Swap it with unsweetened baking chocolate and add more sweetener if needed.
  • Heavy whipping cream: Replace it with coconut cream, and it works as a dairy-free alternative.
  • Peanut butter: Use almond butter, macadamia butter, or sunflower seed butter for a peanut-free version.

Additional Ingredients

  • Chopped pecans or peanuts: The nuts add a crunchy texture that complements the smooth fudge base.
  • Sea salt flakes: The flakes create a flavor contrast that enhances the sweetness and richness of the fudge.
  • Cocoa powder dusting: The powder deepens the chocolate taste and adds a slightly bitter edge to balance the sweetness.

Kitchen Tools Required

  • Small saucepan
  • Mixing bowls
  • Whisk
  • Spatula
  • Loaf pan
  • Toothpick or knife (for swirling)

Tool Substitute Options

  • Loaf pan: You can use a glass container instead of a loaf pan; any square or rectangular dish will work.

How to Make Keto Chocolate Peanut Butter Swirl Fudge: Step-by-Step Guide

Preparation Methods

  • Melting

Preparation Steps

  1. Line a loaf pan with parchment paper, making sure it overhangs for easy fudge removal.
  2. Measure out all ingredients to streamline the process.
  3. Chop any optional add-ins, like pecans or extra chocolate chunks.

Instruction Steps

  1. Melt the Chocolate Mixture
    • In a small saucepan over medium heat, combine the chocolate chips, butter, and heavy cream.
    • Stir constantly until smooth.
    • Remove from heat and whisk in the sweetener, vanilla, and a pinch of salt.
  2. Melt the Peanut Butter Mixture
    • In another bowl, microwave the peanut butter and coconut oil for 30 seconds, then stir.
    • Add sweetener if desired.
  3. Create the Swirl Effect
    • Pour half of the chocolate mixture into the prepared pan.
    • Spoon the peanut butter mixture on top in dollops.
    • Add the remaining chocolate on top.
    • Use a toothpick or knife to swirl the layers together.
  4. Chill Until Set
    • Refrigerate for at least 1 hour or until firm.
    • Cut into squares and enjoy!

Chef's pro tip

One common mistake is overheating the chocolate, which can cause it to seize or turn grainy. Melt it over medium heat, stirring constantly, and remove once smooth. If using a microwave, heat in 15–20 second bursts, stirring between each. For clean slices, run a sharp knife under hot water before cutting. This prevents the fudge from cracking.

What to Serve with Keto Chocolate Peanut Butter Swirl Fudge

  • With coffee or tea: The warm, bitter notes of coffee or tea balance the rich sweetness of the fudge beautifully.
  • Topped with whipped cream: Light, airy whipped cream adds a creamy contrast that enhances the fudge’s indulgence.
  • Alongside fresh berries: Juicy berries add a refreshing tartness that pairs perfectly with the fudge’s rich, chocolatey flavor.

How to Make It Healthier

  • Use dark chocolate (85% or higher): It contains less sugar and more antioxidants than regular sugar-free chocolate chips.
  • Cut back on sweetener: Use the minimum amount of erythritol needed or replace it with monk fruit for a more natural option.
  • Add chia seeds or ground flaxseed: These add extra fiber and omega-3s without changing the taste much.

Time-Saving Tips

Double the batch and store extra pieces in the freezer for a quick, ready-to-enjoy treat anytime—this saves time on prep and cleanup while keeping you stocked for future cravings.

What Can I Prepare Ahead of Time?

  • Measure and store ingredients in separate containers so they’re ready when needed.
  • Chop any add-ins, like pecans or extra chocolate chunks, in advance.

Storage Instructions

  • Store in an airtight container in the fridge for up to 7 days.
  • For longer storage, freeze in a zip-top bag for up to 3 months.

Note: Let the fudge sit at room temperature for 5-10 minutes to soften before eating. Do not microwave!

Recipe Wrap-Up and Conclusion

This Keto Chocolate Peanut Butter Swirl Fudge is the perfect combination of rich chocolate and creamy peanut butter, with a beautiful marbled look that makes it as appealing as it is delicious. It's quick to make, requires no baking, and stays fresh in the fridge, making it an ideal keto dessert for any occasion. Try it out and let us know how you like it!

Frequently asked questions

Yes! Almond butter or macadamia butter are great low-carb alternatives.

If your fudge is too soft, it may need more time in the fridge. You can also add an extra tablespoon of coconut oil or butter to firm it up.

Absolutely! Store it in an airtight container in the freezer for up to 3 months. Just let it sit at room temperature for a few minutes before eating.

Powdered erythritol, monk fruit, or allulose work best because they dissolve smoothly without a gritty texture.

📖 Recipe

Keto Chocolate Peanut Butter Swirl Fudge cut into cubes and rectangles ready to be served.

Keto Chocolate Peanut Butter Swirl Fudge

With a luscious chocolate base and swirls of nutty peanut butter, it’s a decadent treat that’s easy to make and even easier to love.
No ratings yet
Print Rate Pin Recipe
Course: Dessert, Snack
Cuisine: American
Prep Time: 10 minutes
Cook Time: 5 minutes
Chilling Time: 1 hour
Total Time: 1 hour 15 minutes
Servings: 12
Calories: 212kcal

Ingredients

  • 1 cup sugar-free chocolate chips
  • ½ cup heavy whipping cream
  • ¼ cup unsalted butter
  • ¼ cup powdered erythritol
  • ½ teaspoon vanilla extract
  • ½ cup natural peanut butter unsweetened, smooth or crunchy
  • 1 tablespoon coconut oil
  • Pinch of salt
US Customary - Metric

Instructions

Preparation Steps

  • Line a loaf pan with parchment paper, making sure it overhangs for easy fudge removal.
  • Measure out all ingredients to streamline the process.
  • Chop any optional add-ins, like pecans or extra chocolate chunks.

Instruction Steps

  • In a small saucepan over medium heat, combine the chocolate chips, butter, and heavy cream. Stir constantly until smooth. Remove from heat and whisk in the sweetener, vanilla, and a pinch of salt.
  • In another bowl, microwave the peanut butter and coconut oil for 30 seconds, then stir. Add sweetener if desired.
  • Pour half of the chocolate mixture into the prepared pan. Spoon the peanut butter mixture on top in dollops. Add the remaining chocolate on top. Use a toothpick or knife to swirl the layers together.
  • Refrigerate for at least 1 hour or until firm. Cut into squares and enjoy!

Nutrition

Nutrition Facts
Keto Chocolate Peanut Butter Swirl Fudge
Amount Per Serving
Calories 212 Calories from Fat 171
% Daily Value*
Fat 19g29%
Saturated Fat 10g63%
Trans Fat 0.2g
Polyunsaturated Fat 2g
Monounsaturated Fat 5g
Cholesterol 21mg7%
Sodium 5mg0%
Potassium 71mg2%
Carbohydrates 12g4%
Fiber 2g8%
Sugar 1g1%
Protein 3g6%
Vitamin A 264IU5%
Vitamin C 0.1mg0%
Calcium 13mg1%
Iron 1mg6%
*

Nutritional values are estimates only and do not include carbs from sugar alcohols.

# Hashtag with us!Don't forget to mention @castiron_keto or tag #castironketo on Instagram with your creations! We love seeing what you're making.
«
»

Reader Interactions

Leave a Reply

Your email address will not be published. Required fields are marked *

Recipe Rating