01 - Line an 8 x 8 inch square baking pan with parchment paper, leaving an overhang for easy removal.
02 - In a medium saucepan over low heat, combine white chocolate, sweetened condensed milk, and butter. Stir constantly until the chocolate is completely melted and smooth.
03 - Remove the saucepan from heat. Stir in peppermint extract and a pinch of sea salt.
04 - Pour the mixture into the prepared pan and smooth the surface with a spatula.
05 - Evenly sprinkle the crushed peppermint candies over the top, gently pressing them into the fudge.
06 - Let cool at room temperature for 10 minutes, then refrigerate for at least 2 hours or until firm.
07 - Lift the fudge out using the parchment paper overhang, cut into 36 squares, and serve.