Spinach Chicken Pasta Bake

shared by Patty H. (I found this in the Nevada paper. It has a wonderful flavor and is fairly easy to put together.)
Ingredients:
1 T. olive oil
2/3 cup chopped onion
10-ounce package frozen chopped spinach, thawed
8 ounces rigatoni, cooked according to package directions and drained (I used mini penne)
3 cups cubed cooked chicken
14.5 ounce can diced tomatoes (don't drain)
8-ounce package cream cheese softened
1 teaspoon salt
1/2 teaspoon coarse ground pepper
1 1/2 cups shredded mozzarella cheese

Directions:
1. Preheat oven to 375
2. Saute onions in olive oil until tender.
3. Drain spinach well.
4. Combine spinach, pasta, chicken, tomatoes, cream cheese, salt and pepper in skillet with onion. Mix well.
5. Transfer mixture to a baking dish (I sprayed it with non-stick spray.
6. Sprinkle with mozzarella cheese.
7. Bake uncovered for 30 minutes or until hot and bubbly.