Heat oven to 400ºF. Spray bottom and sides of 13x9-inch pan with cooking spray or grease with shortening. In medium bowl, mix flour, cornmeal, sugar, baking powder and 1/4 teaspoon salt. In small bowl, stir together milk, oil and egg. Add egg mixture all at once to flour mixture; stir just until moistened. Spread batter in pan. Bake 10 to 13 minutes or until light golden brown.