HEAT oven to 325°F.
LINE 13x9-inch pan with foil, with ends of foil extending over sides. Mix graham crumbs, 3 Tbsp. sugar and butter; press onto bottom of pan. Bake 10 min.
BEAT cream cheese, 1 cup sugar and extract in large bowl with mixer until well blended. Add sour cream and chocolate; mix well. Add eggs, 1 at a time, mixing on low speed after each just until blended. Pour over crust.
BAKE 40 min. or until center is almost set. Cool. Refrigerate 4 hours. Use foil handles to lift cheesecake from pan before cutting to serve. Top each piece with a dollop of COOL WHIP and candy cane.