Place apples in greased 9x13-inch baking pan. Sprinkle with 1/2 teaspoon cinnamon. Mix sugar, flour, and baking powder. Stir egg into dry mixture with a fork. Spread the crumb mixture over apples. Pour melted butter over all and sprinkle with remaining cinnamon. Bake at 375 degrees for 40-45 minutes or until apples are done.