In a large bowl, cream butter and brown sugar until light and fluffy. Beat in egg. Combine the oats, flours, milk powder, baking powder and salt; gradually add to creamed mixture and mix well. Stir in malted milk balls.

Drop by heaping tablespoonfuls 3 in. apart onto ungreased baking sheets. Bake at 350° for 10-14 minutes or until set and edges begin to brown. Cool for 2 minutes before removing from pans to wire racks. Yield: 2-1/2 dozen.