Mix graham cracker crumbs, 1/4 cup sugar, and melted butter; press firmly onto the bottom of a 9-inch springform pan.
Beat cream cheese and remaining sugar in a large bowl with electric mixer on medium speed until well blended. Add melted chocolate; mix well.
Pour over crust. Bake for 55 minutes or until the center is almost set. Run a small knife or metal spatula around the sides of the pan to loosen crust; cool before removing the rim.
Notes
Ensure the cheesecake is completely chilled before slicing and serving for the best results.