Use parchment paper and line your 8X8 pan.

Put the Oreos in a bag and crush them into pieces.

Dump the white chocolate package into a heat-safe glass bowl.

Put 1-2 inches of water in a pot and put the chocolate-filled bowl on top of the pot. Make sure that the bowl isn't touching the water that is in the pot.

Heat over low or medium heat, stirring a lot until the chocolate is all melted.

Add in the marshmallow fluff and the condensed milk. Stir.

Add in the crushed Oreos and stir.

Pour the mixture into the baking pan and spread out. Cover and put in the fridge to chill overnight.