Cream together butter, sugars, egg and vanilla. Whisk together flour, baking soda, baking powder and salt and stir into butter mixture. Add in oats, corn flakes, walnuts and coconut.
Preheat oven to 400 degrees. Drop by tablespoon (rolled into balls) onto ungreased cookie sheet. Flatten dough with a fork. Bake for 10 minutes. Cool on wire racks.