Cream Together The Butter, Shortening, Sugar, And Vanilla Until Light And Fluffy. Blend In Eggs. Combine Dry Ingredients In A Bowl. Add To Creamed Mixture Alternately With Milk. Blend Well. Pour Into Two Generously Greased And Floured 9" Round Cake Pans. Bake At 350 Deg F For 30 To 35 Minutes Or Until Cake Tester Comes Out Clean. Cool, Remove From Pans And Ice As Desired. From Helen Haydon, Kcmo.