COMBINE graham cracker crumbs and butter in small bowl. Press into bottom of prepared pan. Heat 1/4 cup of Reese's Spread in a microwave safe bowl for approximately 20 seconds or until a pourable consistency is reached. Immediately combine spread and sweetened condensed milk, stirring well to combine. Pour sweetened condensed milk and spread mixture evenly over crumb mixture. Layer with coconut, chocolate chips, Reese's Pieces candies and nuts if desired. Press down firmly with fork.