01 -
Line a 20 x 20 cm square pan with two sheets of parchment, each extending 5 cm beyond all edges, arranged in a plus sign formation for easy removal.
02 -
In a medium saucepan over low heat, combine white chocolate chips and sweetened condensed milk. Stir occasionally until smooth and fully melted, approximately 5 minutes.
03 -
Add Marshmallow Fluff, unsalted butter, vanilla bean paste, and peppermint extract. Stir continuously over low heat until ingredients are incorporated and mixture is homogeneous, about 1 minute.
04 -
Transfer fudge evenly into four medium bowls, approximately 240 millilitres per bowl. Tint each bowl individually with black, pink, yellow, and teal gel food coloring, adjusting the intensity as desired, and mix quickly to prevent premature setting.
05 -
Spoon dollops of differently colored fudge randomly into the prepared pan. Swirl gently with a toothpick or paring knife until a marbled pattern forms, taking care not to overmix.
06 -
Refrigerate, uncovered, until fudge is firm and fully set, at least 2 hours or overnight for best results.
07 -
Lift the fudge slab from the pan using parchment overhang and set onto a cutting board. Slice into 36 squares using a sharp knife.