Graham Streusel Coffee Cake
["1 1/2 c. graham cracker crumbs (about 21 crackers)", "3/4 c. chopped pecans or walnuts", "3/4 c. packed brown sugar", "1 1/2 tsp. ground cinnamon", "2/3 c. margarine or butter, melted", "1 pkg. (2-layer size) yellow or white cake mix", "1 c. water", "1/4 c. cooking oil", "3 eggs", "powdered sugar"]
["For", "streusel,\tin", "a medium mixing bowl combine graham cracker", "crumbs, chopped nuts, brown sugar and cinnamon.", "Stir in melted margarine or butter.", "Set aside."]
["graham cracker crumbs", "pecans", "brown sugar", "ground cinnamon", "margarine", "water", "cooking oil", "eggs", "powdered sugar"]