Mix first 4 ingredients; press onto bottom and 1 inch up side of 9-inch springform pan.
Bake 10 min. or until lightly browned. Cool.
Microwave caramels, cream and coffee granules in large microwaveable bowl on MEDIUM (50%) 2 to 3 min. or until caramels are completely melted, stirring after each minute. Stir in nuts; spread onto bottom of crust.
Refrigerate 1 hour or until firm. Melt chocolate as directed on package; drizzle over tart. Refrigerate until firm.