In bowl, beat the egg and milk.
Stir in cheese, oats, onion and salt.
Add beef and mix well.
Shape into 8 loaves; place in greased 13x9x2 baking dish.
Combine ketchup, brown sugar and mustard; spoon over loaves.
Bake uncovered 350 degree for 45 minutes or until the meat is no longer pink and a meat thermometer reads 160 degrees.