MIX Base Cake, sugar and butter. Press 1 cup of the base cake mixture firmly onto bottom of each of 4 (9-inch) springform pans. (Or, use 1 [9-inch] springform pan for trial recipe.)
PREPARE Cheesecake Filling with milk as directed on package. Stir in OREO Pieces. Pour evenly over prepared crusts.
REFRIGERATE at least 3 hours.