1 lb. ground beef
1/2 tsp. garlic salt
1/3 c. bread crumbs
2/3 c. milk
1/3 c. catsup
1 (2 oz.) jar mushrooms
1/4 tsp. oregano
1 tbsp. Parmesan cheese
4 slices American cheese

Mix first 4 ingredients together in bowl. Press against bottom and sides of 9- inch pie pan. Combine catsup, mushrooms, oregano and Parmesan cheese in small bowl. Spread over beef mixture. Garnish with American cheese. Bake at 400 degrees for 1/2 hour. Cut in wedges.