1 lb. lean ground beef
1 c. uncooked oats
15 1/2 oz. spaghetti sauce
1/2 c. chopped onion
1/3 c. grated Parmesan cheese
1 egg
1 tbsp. Worcestershire sauce
1 tsp. pepper
1/2 c. shredded Mozzarella
1/3 c. of any or all of the following: sliced mushrooms, sliced black olives, shredded zucchini, shredded Mozzarella

Heat oven to 350 degrees. Grease 8 inch baking pan. Combine ground beef, oats, 1/2 cup spaghetti sauce, onion, Parmesan cheese, egg, Worcestershire sauce, and pepper; mix well.

Separate mixture into two parts. Shape each into a patty about 7 inches in diameter. Place stuffing choices on one patty to within 1/2 inch of edge. Top with other patty. Pinch sides together to enclose stuffing; smooth edges into rounded loaf. Place into pan.

Bake 40-45 minutes or until meat is done. Top with 1 cup spaghetti sauce and Mozzarella cheese. Garnish with black olives and serve with remaining sauce.