Combine pumpkin, beaten egg, 1/3 cup sugar and spice. Spoon half the batter into a greased 9x13 pan. Sprinkle half the streusel over batter. Spread pumpkin mixture over that. Carefully spread remaining batter and then finish with the streusel. Bake at 325 for 50-60 minutes, or until a toothpick inserted in the middle comes out clean.