Preheat oven to 350°. In a large bowl, cream butter and sugar until light and fluffy, 5-7 minutes. Beat in eggs and extracts. In another bowl, whisk flour and baking powder; gradually beat into creamed mixture., Drop by tablespoonfuls 2 in. apart onto greased baking sheets. Bake 8-10 minutes or until light brown. Remove from pans to wire racks to cool completely., For glaze, in a large bowl, mix confectioners' sugar, butter, vanilla and enough milk to achieve spreading consistency. Dip tops of cookies into glaze. If desired, decorate with sprinkles. Let stand until set.