Line an 8×8-inch pan with parchment paper, leaving overhang on the sides.
In a saucepan over low heat, combine white chocolate chips, sweetened condensed milk, and butter.
Stir constantly until fully melted, smooth, and glossy.
Remove from heat and stir in vanilla extract and salt.
Let the mixture cool for 2–3 minutes.
Gently fold in chopped Skittles.
Pour the fudge into the prepared pan and spread evenly.
Press extra Skittles lightly on top.
Refrigerate until fully set, then slice into small squares.
Notes
Let the fudge cool slightly before adding Skittles to prevent melting.Chop candies into small pieces for even texture.Chill completely before cutting for clean slices.Store refrigerated in an airtight container for up to 7 days.