Triple Layer Chocolate Bars
["1 1/2 c. graham cracker crumbs", "1/2 c. Hershey's cocoa, divided", "1/4 c. sugar", "1/3 c. butter or margarine, melted", "1 (14 oz.) can Eagle Brand sweetened condensed milk (not evaporated milk)", "1/4 c. all-purpose flour", "1 egg", "1 tsp. vanilla extract", "1/2 tsp. baking powder", "3/4 c. chopped nuts", "2 c. (12 oz. pkg.) Hershey's semi-sweet chocolate chips"]
["Heat oven to 350\u00b0.", "Combine crumbs, 1/4 cup cocoa, sugar and butter; press firmly on bottom of 13 x 9-inch baking pan."]
["graham cracker crumbs", "'s cocoa", "sugar", "butter", "condensed milk", "all-purpose", "egg", "vanilla extract", "baking powder", "nuts", "chocolate chips"]