01 -
Lay a piece of parchment paper in a 9x9-inch pan. Ensure some edges hang over the sides for easier lifting later.
02 -
Mix the red dye with the semi-sweet chocolate chips in a bowl, then set the bowl aside.
03 -
In a big pot, melt the butter. Stir in the sugar and half-and-half, then mix until smooth and combined.
04 -
Put the marshmallow fluff and white chocolate pieces into another mixing bowl.
05 -
Add the vanilla, white chocolate, and marshmallow mixture to the pot with butter and sugar. Stir everything until it's even.
06 -
Take half the white chocolate mix and quickly pour it over the red chocolate chips. Mix it until the red chocolate chips are melted completely.
07 -
Drop spoonfuls from both bowls into the prepared pan. Shake the pan gently to smooth it out, then swirl the colors together using a knife.
08 -
Leave the fudge to fully firm up. Lift it out using the paper edges, then cut it into small squares.