Cook 10 ounce spaghetti and spread in greased 9 x 13 inch pan (10 x 15 inch pan). Beat 2 eggs with fork; add 2 cups milk and pour over spaghetti. Sprinkle 4 ounces shredded Cheddar cheese over mixture. Brown 1 pound ground beef; drain and season to taste. Spread beef over mixture. Pour 32 ounce spaghetti sauce and 1 teaspoon oregano over mixture. Sprinkle 12 ounces Mozzarella cheese over top. Bake at 350 degrees about 40-45 minutes. Let set 5 minutes. Then slice and serve.