Spray 13x9" baking pan with nonstick cooking spray.
Combine flour, baking soda, cinnamon and nutmeg.
Beat egg and sugar on high speed 1 minute.
Alternately beat in flour and buttermilk.
Stir in 1-1/2 cups of cereal.
Sprinkle top with remaining cereal.
Bake 15 minutes or until toothpick inserted in center comes out clean.