Preheat oven to 400°. In a large bowl, cream butter and sugar until light and fluffy, 5-7 minutes. Combine eggs and milk. Combine flour, cornmeal, baking powder and salt; add to creamed mixture alternately with egg mixture., Pour into a greased 13x9-in. baking pan. Bake 22-27 minutes or until a toothpick inserted in center comes out clean. Cut into squares; serve warm.