These are tasty cookies
In a mixing bowl, cream butter and sugars. Beat in egg and vanilla. Combine flour, oats, cereal, baking soda and baking powder; gradually add to creamed mixture. Roll into 3/4-in. balls. Place 2 in. apart on ungreased baking sheets; flatten with a fork. Bake at 375 degrees F for 10-12 minutes or until lightly browned. Cool for 3 minutes before removing to wire racks.