Layered Mint Brownies

Preheat oven to 350 degrees. Grease bottom only of 8- or 9-inch square pan.

Prepare brownies according to package directions, using egg, water and oil.  Stir in chopped cookies. Bake according to package directions.

Cool for 1 hour. In medium bowl, mix 4 tablespoons butter, powdered sugar, milk, peppermint extract and green food coloring until fluffy. Spread over brownies. Refrigerate 1 hour.

For chocolate glaze, combine remaining 4 tablespoons butter and chocolate chips and microwave in 30-second intervals, stirring until smooth. Stir in vanilla. Pour over green frosting and spread. Refrigerate 1 hour.