Add white chocolate chips, butter, sweetened condensed milk and peppermint extract to a microwave-safe bowl.Microwave for around 2 and a half minutes (or until chocolate chips are completely melted); stirring halfway through cooking time.Stir until thoroughly combined; pour into a greased 8X8 baking pan.Sprinkle with desired amount of crushed candy canesLightly press candy canes into the fudge.Refrigerate until firm (around 1-2 hours)Note: A silicone baking dish can be used for best results.