In a large bowl, cream together the butter, brown sugar and white sugar until smooth. Stir in the egg and vanilla. Sift together the flour, baking soda, salt and baking powder; stir into the creamed mixture.
Add the oatmeal, crushed cereal and coconut and mix until combined.
Drop dough by teaspoonfuls onto a cookie sheet. Cookies should be about 2 inches apart.
Bake for 10 to 12 minutes in the preheated oven. Cookies should be light brown at the edges and on the bottom.