Step 1

Preheat oven to 350 degrees F (175 degrees C). Grease cookie sheets.

Step 2

In a large bowl, cream together the butter, white sugar, and brown sugar until smooth. Beat in the egg, then stir in the vanilla. Combine the flour, baking powder, and baking soda; stir into the creamed mixture. Mix in the oats, white chocolate, and macadamia nuts until evenly distributed. Drop by teaspoonfuls onto the prepared cookie sheets.

Step 3

Bake for 10 to 12 minutes in the preheated oven, or until edges are toasted. For crisper cookies, bake longer. If you leave the cookies on the cookie sheet for a few minutes before transferring to cool on wire racks you will have a softer bottomed cookie.