In a medium microwave safe bowl add the white chocolate chips and butter. Cook in the microwave in 30 second intervals, stirring with a spatula each time, until fully melted and mixed.
Add all but 6 of the sandwich cookies to a zipper bag and crush leaving no pieces bigger than a quarter of a cookie.
Add the sweetened condensed milk to the butter and white chocolate mixture. Stir together until full incorporated. Add crushed cookies and stir together.
Place a piece of parchment into the 9x9 baking dish. Pour fudge mixture into the dish and press into corners until flattened.
Break each of the remaining cookies in half and press them into the top of the fudge (work quickly as it will start to set almost right away).
If you wanting to eat soon - place in the freezer for 30 minutes. If you have time, you can place it in the fridge for a few hours. Once fully set you can cut into 16 pieces and store in an airtight container.
Keyword cookies n' cream, fudge, no bake, no bake dessert, oreos, sandwich cookies, sweetened condensed milk, white chocolate