In medium bowl, mix flour, baking powder and salt; set aside. In large bowl, beat 1 cup butter with electric mixer on medium speed 30 seconds. Gradually add granulated sugar, about 1/4 cup at a time, beating well after each addition. Beat 2 minutes longer. Add eggs, one at a time. Beat in 1 teaspoon vanilla. On low speed, gradually beat in flour mixture, alternately with 2/3 cup milk, beating just until blended. Divide batter evenly among muffin cups.