Preheat oven to 350 degrees F (325 degrees F for glass dish). In small bowl, combine graham cracker crumbs and butter; mix well. Press crumb mixture firmly on bottom of 13x9-inch baking pan. Top evenly with coconut then pour sweetened condensed milk evenly over coconut layer.
Bake 25 minutes or until lightly browned.
In small saucepan, over low heat, melt chocolate chips with peanut butter. Spread evenly over hot coconut layer.
Cool 30 minutes. Chill thoroughly. Cut into bars. Garnish as desired. Store loosely covered at room temperature.