Combine the chocolate crumbs, butter and sugar in a bowl and toss until the crumbs are evenly coated. Press crumbs into the bottom of an 8-inch square pan. Bake for 8-10 minutes. Remove from oven and cool. Reduce oven temperature to 325 degrees F.
For the cream cheese filling- combine the cream cheese, sugar, vanilla and egg in the bowl of a stand mixer. A hand mixer can also be used. Mix on medium speed until the ingredients are uniformly mixed and there are no visible lumps of cream cheese. Pour the cheesecake filling over the crust.
If the Dark Chocolate Cherry Sauce is not pour-able, heat for 15-30 seconds in a microwave or in a small saucepan over low heat. Spoon the Chocolate Cherry Sauce randomly on top of the cheesecake filling and then swirl with a knife, making sure to not disturb the crumb crust, to form a feathery pattern.
Bake in a 325 degree oven for 35-40 minutes, or until the center is firm, but still jiggles a little.