1. For the cheesecake layer, grab a medium size bowl, mix the softened cream cheese, sugar, vanilla extract and egg. Set aside. 2. In a bowl, mix together the cocoa powder, flour, and salt together, then set aside until ready to use. 3. In a seperate bowl, melt the butter with the chocolate. Add in the sugar and mix until very well combined, about one minute. Add in the eggs, then fold in the dry ingredients. Pour the cheesecake layer over the brownie batter, then add on the crushed Oreos. 4. Pour your batter into a 9x9 inch and bake at 350 degrees for 30-35 minutes.