1 lb. ground beef
2 (8 oz.) cans tomato sauce
8 slices American cheese
2 c. Bisquick baking mix
1 egg
2/3 c. milk
1 tsp. oregano
1 can sliced mushrooms
1/4 c. grated Parmesan cheese

Cook and stir ground beef until brown, drain. Mix in 1 can tomato sauce and the oregano, simmer uncovered for 10 minutes. Stir baking mix, egg and milk to soft dough. Spread half of the dough in greased pan 9 x 9 x 2 inches. Pour remaining can of tomato sauce over dough, spread evenly. Layer 4 slices cheese, then meat mixture, mushrooms, remaining cheese slices and Parmesan cheese. Cover with remaining dough. Bake for 20 to 25 minutes in 400 degree oven. Serves 4 to 6 people.