1. Combine flour, baking powder, soda, salt, cinnamon, and nutmeg. Set aside.
2. In large mixing bowl, beat sugar, oil and eggs until well combined. Stir in Kellogg's Raisin Bran® cereal, orange peel, vanilla, zucchini and nuts. Add flour mixture, mixing until thoroughly combined. Spread evenly in 9 x 9 x 2-inch baking pan coated with cooking spray.
3. Bake at 350°F for 35 minutes or until tests done. Cool completely. Serve sprinkled with powdered sugar, if desired.