Combine flour, baking powder and salt; set aside. In large bowl, cream butter and sugar with electric mixer until light and fluffy. Add eggs and vanilla; mix well. Add flour mixture alternately with milk, beating well after each addition. Continue beating one minute. Pour into prepared cups. Bake 18-20 minutes or until toothpick inserted into center of cupcake comes out clean. Cool 10 minutes. Turn out onto cooling rack; cool completely.