Mix OREO Small Pieces and butter. Press 1-1/3 cups of the OREO mixture firmly onto bottom of each (9-inch) springform pan. Bake in 325°F-standard oven 10 min. Cool on wire racks while preparing Filling.

Place cream cheese in large bowl of electric mixer fitted with paddle attachment. Beat on medium speed until creamy. Add sugar; beat until well blended. Add sour cream and vanilla; mix well. Add eggs, 1 at a time, mixing on low speed after each addition just until blended. Stir in 1-1/4 qt. of the OREO Medium Pieces. Pour 2-qt. of the batter over each crust; sprinkle each with 3/4 cup of the remaining OREO Medium Pieces.

Bake 1 hour 10 min. to 1 hour 20 min. or until center is almost set. Run knife or metal spatula around rim of each pan to loosen cake; cool before removing rim of pan. Refrigerate 4 hours or overnight.