In a medium saucepan add your chocolate chips, sweetened condensed milk, and butter. Turn your heat on low and stir until melted and creamy.
Add the marshmallow cream and stir to combine. Add in the crumbled Oreo. Lightly stir to combine.
Line your 8x8 pan with parchment paper. Pour your fudge mixture into the baking dish.
In a medium saucepan add the white chocolate chips. sweetened condensed milk, and butter.
Over low heat stir until melted and creamy then add in the marshmallow cream. Stir to combine. Remove from the heat. Let cool for 2-3 minutes.
Stir in 3 Tablespoons Halloween sprinkles. Pour the white chocolate over the chocolate layer.
Top with the remaining sprinkles. Add candy eyeballs keeping two next to each other for the correct eyes look.
Let set for 3 hours then cut into 1 1/2 inch squares. Store in a sealed container.