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A rectangular slab of marshmallow swirl fudge with visible white marshmallow streaks

Ultimate Marshmallow Swirl Fudge

Indulge in this rich and creamy Ultimate Marshmallow Swirl Fudge, featuring a perfect blend of semi-sweet chocolate, sweetened condensed milk, and fluffy marshmallows swirled throughout. This easy-to-make treat is perfect for satisfying your sweet tooth or sharing with friends and family.
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Prep Time 15 minutes
Cook Time 10 minutes
Total Time 4 hours 10 minutes
Servings: 16 squares
Calories: 250
Ingredients Equipment Method Notes

Ingredients
  

Fudge Base
  • 1 bag good quality semi-sweet chocolate chips (12-ounce)
  • 1 can sweetened condensed milk (14-ounce)
  • 1/4 cup unsalted butter
  • 1 teaspoon vanilla extract
  • 5 cups mini marshmallows divided
  • 1/4 teaspoon salt

Equipment

  • 8x8-inch baking pan
  • Parchment paper or foil
  • Medium-sized heavy-bottomed saucepan
  • Heatproof spatula or wooden spoon
  • Knife
  • Cutting board

Method
 

Preparation
  1. Line an 8x8-inch baking pan with parchment paper or foil, leaving an overhang, then lightly grease it.
  2. Combine chocolate chips, sweetened condensed milk, butter, and salt in a medium heavy-bottomed saucepan.
  3. Melt and stir the mixture over low to medium-low heat for 5-7 minutes until smooth and glossy; avoid scorching.
  4. Remove from heat and stir in vanilla extract until well combined.
  5. Pour two-thirds of the fudge mixture into the prepared pan and spread evenly.
  6. Stir 3 cups of mini marshmallows into the remaining fudge in the saucepan and heat over very low heat until melted.
  7. Dollop the marshmallow-chocolate mixture over the fudge in the pan, scatter the remaining 2 cups of marshmallows on top, and gently swirl with a knife.
  8. Refrigerate the fudge for at least 3-4 hours until completely firm.
  9. Lift the fudge out of the pan using the parchment paper, place on a cutting board, and cut into 1-inch squares.

Notes

For extra flavor, you can add a pinch of cinnamon or a teaspoon of instant coffee with the chocolate chips. Ensure you use good quality chocolate chips for the best flavor and texture. If you don't have an 8x8 inch pan, a similar sized dish will work, but the thickness of the fudge may vary slightly. Make sure to work quickly once the chocolate is melted, as it will start to set as it cools.