Begin by melting 2 cups of white chocolate chips and 2 tablespoons of unsalted butter together in a double boiler or microwave. If using the microwave, heat at 50% power for 30-second intervals, stirring until completely smooth.

Once melted, remove from heat and stir in one 14-ounce can of sweetened condensed milk until thoroughly combined and creamy.

Add 1 cup of marshmallow fluff to the melted mixture and gently fold it in until everything is well blended and silky.

Mix in 1 teaspoon of vanilla extract and ½ teaspoon of peppermint extract, stirring well to infuse the fudge with delightful holiday flavors.

Separate the fudge mixture into four bowls, then add a few drops of gel food coloring to each bowl—black, pink, yellow, and teal.

Pour one layer of the colored fudge mixtures into the pan, alternating between colors, and use a toothpick or knife to lightly swirl the colors together.

Refrigerate your assembled fudge for about 2 hours, or until it is firm to the touch.

Once the fudge has set, remove it from the refrigerator and lift it out of the pan using the parchment paper and cut into square or rectangular pieces.