Baked Ziti

8 oz. dried penne pasta
1 jar tomato sauce
1 lb. lean ground beef
1/2 cup chopped onion
1/4 cup pitted ripe sliced olives
1/2 cup shredded mozzarella cheese

Preheat oven to 375. Cook pasta per directions and drain well. In large stove/oven proof pan, brown ground beef with onion. Drain fat. Stir in tomato sauce. Bring to boil, reduce heat, cover and simmer for 10 minutes. Stir in pasta and olives. Bake covered for 30 minutes; sprinkle with cheese and bake 5 minutes until cheese is melted.