Preheat oven to 350°.
Combine 1/2 cup ketchup, oats, and next 6 ingredients (oats through egg whites) in a large bowl. Add meat; stir just until blended. Shape meat mixture into an 8 x 4-inch loaf on a broiler pan coated with cooking spray. Brush 1/4 cup ketchup over meat loaf. Bake at 350° for 1 hour and 10 minutes. Let stand 10 minutes before slicing.