Italian Sandwich Casserole

2 pounds ground beef

1 onion, chopped

1 cup ketchup

2 cans tomato soup

2 teaspoons oregano

2 teaspoons Worcestershire sauce

2 eggs

1 1/3 cup milk

3 cups flour

2 teaspoons baking powder

2 teaspoons onion salt

12 slices processed American cheese

Preheat oven to 350F. Brown hamburger with onion. Drain. Season with salt and pepper to taste. Add ketchup, soup, oregano, and Worcestershire sauce. Simmer 20 minutes. Meanwhile, combine eggs beaten with milk, flour, baking powder, and onion salt. Spread ½ batter into a greased 9x13 pan. Top with ½ meat mixture, cheese, remaining meat, top with remaining batter. Bake 30 minutes.