HEAT oven to 350ºF.
MIX crumbs and butter; press onto bottom of 9-inch springform pan. Bake 10 min.
MEANWHILE, beat cream cheese, sugar and vanilla with mixer until well blended. Add sour cream; mix well. Add eggs, 1 at a time, beating after each just until blended. Pour over crust.
BAKE 40 to 45 min. or until centre is almost set; cool completely. Refrigerate 4 hours. Top with nuts and caramel topping just before serving.