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.