In large bowl, beat 1 cup butter on medium speed 30 seconds. Gradually add granulated sugar and brown sugar, about 1/4 cup at a time, beating well after each addition, scraping bowl occasionally. Beat 2 minutes longer. Beat in eggs, one at a time, beating well after each addition. Beat in vanilla. On low speed, alternately add flour mixture, about one-third at a time, with 2/3 cup milk, about half at a time, beating just until blended.