Heat oven to 180ºC . Place butter in 13x9x2-inch baking pan. Heat in oven until melted; remove pan from oven. Stir together crumbs, cocoa and sugar; sprinkle evenly over butter. Pour sweetened condensed milk evenly over crumb mixture. Sprinkle with chocolate chips and raisins. Sprinkle nuts on top; press down firmly. Bake 25 to 30 minutes or until lightly browned. Cool completely in pan on wire rack. Cover with foil; let stand at room temperature 6 to 8 hours. Cut into bars. About 36 bars. Variation: Golden Bars: Substitute 1 cup Reese's Peanut Butter Chips for chocolate chips. Sprinkle 1 cup golden raisins or chopped dried apricots over chips. Proceed as above. Hershey's is a registered trademark of Hershey Foods Corporation. Recipe may be reprinted courtesy of the Hershey Kitchens. Meal-Master compatible format by: Karen Mintzias