Pizza Sandwich - cooking recipe

Ingredients

1 lb. ground beef
1 tsp. oregano
2/3 c. milk
1 c. (2 oz.) diced mushrooms
1 c. Parmesan cheese
2 (8 oz.) cans tomato sauce
2 c. Bisquick
1 egg
8 slices American cheese
1 small onion, chopped

Preparation

Brown onion and ground beef.
Drain.
Mix in 1 can tomato sauce and oregano. Simmer uncovered for 10 minutes.