Penne Pasta Casserole

Ingredients:

12oz dry penne pasta, uncooked (12oz=3 cups)
1 pound ground sirloin beef
1 large onion, chopped
1 can (14.5oz) diced tomatoes with basil, garlic, and oregano, undrained
1 can (6oz) tomato paste
1/2 cup water
Non stick cooking spray
3 cups shredded mozzarella cheese

Directions:

1. Preheat oven to 350. Cook pasta according to package directions.
2. Brown meat with onions in a large skillet; drain. Stir in tomatoes with their liquid, the tomato paste and water; cook until heated through, stirring occasionally. Set aside.
3. Spray 13x9 baking dish with cooking spray. Drain pasta; place in large bowl. Add tomato mixture and 2 cups of the cheese; toss to coat. Spoon into prepared dish; sprinkle evenly with remaining 1 cup cheese.
4. Bake 20 to 25 minutes, or until casserole is heated through and cheese is melted.