http://www.kraftrecipes.com/recipes/oreo-cheesecake-bites-112393.aspx
Heat oven to 325°F.
Line 13x9-inch pan with Reynolds Wrap® Aluminum Foil, with ends of foil extending over sides. Finely crush 24 cookies. Melt 1/4 cup butter; mix with cookie crumbs. Press onto bottom of prepared pan.
Beat cream cheese and sugar with mixer until blended. Add sour cream and vanilla; mix well. Add eggs, 1 at a time, beating on low speed after each just until blended. Chop remaining cookies. Gently stir into batter; pour over crust.
Bake 45 min. or until center is almost set. Cool.
Microwave chocolate and remaining butter in microwaveable bowl on HIGH 1 min. or until butter is melted; stir until chocolate is completely melted and mixture is well blended. Cool slightly; spread over cheesecake. Refrigerate 4 hours.
Use foil handles to lift cheesecake from pan before cutting into bars.