1 1/2 lbs. ground beef
1/4 c. chopped onion
1/3 c. tomato sauce
2 tbsp. grated Parmesan cheese
1/2 tsp. oregano
1/2 tsp. salt
1/4 tsp. pepper
1 can biscuits
2 oz. can mushrooms
1 tomato, sliced
1 c. shredded Mozzarella cheese

Preheat oven to 350 degrees. In large fry pan, brown beef and onion; drain fat. Stir in tomato sauce, 1 teaspoon Parmesan cheese, oregano, salt and pepper. Simmer while preparing crust, separate biscuit dough into 10 biscuits. Press biscuits over bottom and sides of greased 9" pan. Spoon meat into crust. Sprinkle with mushrooms. Arrange tomato slices over pie. Sprinkle with Mozzarella cheese and remaining Parmesan cheese. Bake 25 minutes or until brown. For easier serving let stand 5 minutes before cutting into wedges. Refrigerate left overs. 4 to 6 servings.