GREASE 9-inch-square baking pan.

MICROWAVE 1/3 cup morsels and 1/3 cup butter in small, uncovered, microwave-safe bowl on MEDIUM-HIGH (70%) power for 30 seconds; STIR. If necessary, microwave at additional 10- to 15-second intervals, stirring just until morsels are melted. Stir crushed cookies into melted morsel mixture. Press onto bottom of prepared pan. Refrigerate for 10 minutes or until firm.

MEANWHILE, BEAT 1/3 cup butter, milk, 1/2 teaspoon peppermint extract and vanilla extract in medium mixer bowl until smooth. Gradually beat in powdered sugar until smooth and creamy. Add food coloring, 1drop at a time, until desired color is reached. Spread powdered sugar mixture evenly over cookie crumb layer.

MICROWAVE remaining 1 2/3 cups morsels, 1/3 cup butter and 3/4 teaspoon peppermint extract in small, uncovered, microwave-safe bowl on MEDIUM-HIGH (70%) power for 30 seconds; STIR. If necessary, microwave at additional 10- to 15-second intervals, stirring just until morsels are melted. Let stand for 10 minutes. Spread chocolate layer evenly over powdered sugar mixture. Refrigerate for at least 2 hours. For easier cutting, allow bars to sit at room temperature for 10 minutes.