For the cheesecake crust: – 1 1/2 cups oreo cookie crumbs — about 20 cookies – 3 tbsp melted butter For the cheesecake filling: – 16 oz cream cheese — at room temperature – 16 oz mascarpone cheese — at room temperature – 1 1/2 cups sugar – 1 tsp vanilla extract – 1/4 cup heavy cream – 8 oz semi-sweet chocolate, up to 70% cocoa — melted – 4 eggs — large, room temperature For the chocolate ganache: – 8 oz semi-sweet chocolate — chopped – 1/2 cup heavy cream