Crush Oreo cookies by hand (put inside a large zip top bag and crush with rolling pin) or in a food processor. Add in melted butter and optional sugar and mix until it reaches the consistency of wet sand.
Press into a 9x9 baking dish or a 9-inch cake or pie plate.
For cheesecake:
In a skillet add marshmallows and milk. Heat over low until the marshmallows melt and the mixture becomes smooth. Remove from heat.
In the bowl of an electric mixer add cheese cream and vanilla bean paste. Beat for 1 minute. Add in marshmallow mixture and beat for 3 minutes until fluffy.
Fold in whipped topping and add to your prepared dish.
Add to the fridge to set for at least 1 hour. Top with crushed Oreos right before serving.