In large bowl, beat 1 cup butter and the granulated sugar with electric mixer on medium speed about 5 minutes or until light and fluffy. Add eggs, one at a time, beating well after each addition. Beat in 2 teaspoons vanilla. On low speed, alternately add flour mixture, about 1/3 of mixture at a time, and milk, about 1/2 at a time, beating just until blended. Divide batter evenly among muffin cups.