Put 1 OREO cookie into each paper-lined cup. Crush each cookie into crumbs (using a fork or the bottom of a cup) and press the crumbs lightly to form a small crust in the bottom of each cup.
In a medium bowl, beat 1 pkg. (8 oz.) PHILADELPHIA Cream Cheese (softened) and 1/2 cup sugar with an electric mixer until smooth and blended.
Gently fold in 1 tub (8 oz.) COOL WHIP Whipped Topping (thawed) until the mixture is uniform and no streaks remain.
Spoon or pipe the cream cheese mixture evenly over the crushed-cookie crusts, filling the 12 cups.
Sprinkle 2 Tbsp. multi-colored sprinkles evenly over the tops of the mini cheesecakes.
Refrigerate the cheesecakes for 1 hour to set before serving.