Crush the Mint Oreo Cookies in a ziploc bag until the cookies are in small chunks. Set aside.
Chop the white chocolate or break it into small chunks. Melt in the microwave on 50% power for 30-second increments, stirring well after each increment, until fully melted.
Add the sweetened condensed milk, peppermint extract and food colouring (if using) and stir together well until a thick dough forms and everything is incorporated well.
Add about 2/3 of the Mint Oreo Cookie crumbs into the dough and stir to distribute them throughout the mixture.
Press the fudge mixture into an 8-inch by 8-inch square baking pan lined with parchment paper.
Sprinkle the remaining Mint Oreo Cookie crumbs onto the top of the fudge and press them into the top lightly.
Refrigerate for at least 2 hours or overnight before slicing.
Store in the fridge in an airtight container until ready to serve.
Video
Notes
Store the fudge after it's been sliced in an airtight container in the fridge.The fudge can also be made in advance and stored in the freezer in an airtight container for up to a month.