In a large bowl, cream the butter and sugars until light and fluffy. Beat in eggs and vanilla. Combine the flour, baking soda, baking powder and salt; add to creamed mixture and mix well. Stir in oats and chocolate chips.
Drop by rounded tablespoonfuls 2 inches apart onto ungreased baking sheets. Bake at 350° for 11-12 minutes or until golden brown. Cool on wire racks.