1. In pie plate or shallow bowl, combine Kellogg's Corn Flakes® cereal, garlic salt and oregano. Place flour in second pie plate or bowl. Set aside.
2. In small bowl, beat egg whites and water with fork until thoroughly combined. Set aside.
3. Cut tomatoes in 1/2-inch slices. Dip tomatoes in flour, then in egg mixture, then cereal mixture. Carefully repeat dipping in egg mixture and cereal mixture to double coat completely. Place in single layer on foil-lined baking sheet coated with cooking spray.
4. Bake at 400° F for 8 minutes or until tender and lightly browned. Serve hot.