Line a 9x9-inch baking pan with parchment paper, letting the edges extend over the sides.
In a separate bowl, combine the semi-sweet chocolate chips and red food coloring. Set aside.
1 cup semi-sweet chocolate chips, 3 tablespoons red food coloring
Melt the unsalted butter in a large saucepan.
¾ cup unsalted butter
Add the granulated sugar and half-and-half cream to the saucepan, mixing until well combined.
3 cups granulated sugar, ⅔ cup half-and-half cream
In another bowl, combine the white chocolate chips and marshmallow crème.
2 cups white chocolate chips, 7 ounce jar of marshmallow crème
Stir the vanilla extract, white chocolate chips, and marshmallow crème into the butter and sugar mixture until smooth.
2 teaspoons vanilla extract
Quickly transfer about half of the white chocolate mixture to the bowl with the red-tinted chocolate chips, stirring until the chocolate is fully melted.
Spoon dollops of both mixtures into the prepared pan.
Level the surface by giving the pan a gentle shake.
Use a small knife to create swirl patterns in the fudge.
Allow the fudge to cool completely.
Lift the fudge from the pan using the overhanging parchment paper and cut into squares.
Serve - Enjoy!