LET cheesecake batter stand at room temperature 1 hour.
MIX base cake and butter; press onto bottoms of 4 (9-inch) springform pans (or onto bottom of 1 [9-inch] springform pan for trial recipe), adding 13 oz. base mixture to each pan.
BAKE in 325ºF standard oven 8 min. Cool.
COMBINE cheesecake batter and OREO Pieces; pour evenly over crusts. Place in water bath, using separate water-filled pan for each cheesecake. (See directions on tub of Cheesecake Batter for how to prepare water baths.)
BAKE 1 hour 35 min. to 1 hour 45 min. or until centers are almost set; cool completely. Refrigerate several hours or overnight.