
Prepare an 8x8 inch square pan with parchment paper or by greasing it.
Melt white chocolate chips, sweetened condensed milk, and butter in a saucepan over low heat until smooth.
Stir in cotton candy flavoring and divide the mixture into two bowls.
Add pink and purple gel food coloring to each bowl respectively, mixing thoroughly.
Pour the pink fudge mixture into the pan and add dollops of the purple mixture.
Swirl the purple fudge into the pink to create a marbled effect.
Refrigerate the fudge for at least 2 hours until firm, then cut into squares.