Chicken & Spinach Pasta Bake

I am loving Pinterest!  If you haven't checked it out and you like to cook, you should!  All of the recipes I've tried so far from there have been great.  This is another recipe from Pinterest with a few changes of my own.  Enjoy!

Chicken & Spinach Pasta Bake

3 chicken breasts, cooked and cubed
1 small onion, chopped
1 tbsp olive oil
1 tsp minced garlic
1 8oz container chive & onion cream cheese
1 can Italian style tomatoes, drained
1 pkg frozen spinach, thawed
1/2 tsp salt
1/2 tsp pepper
1 tsp Italian seasoning
8oz rigatoni pasta
3 cups mozzarella cheese
Cook chicken.  Cook pasta according to package directions.  Place olive oil in large 9x13 baking dish.  Add chopped onions, toss in oil.  Bake at 375 degrees for 8 minutes.  Add 1 tsp garlic, place back in oven for 5 more minutes or until onions are soft.  Meanwhile, drain thawed spinach on paper towels.  Place onions and garlic in large bowl, add cream cheese, spinach, tomatoes, and seasoning.  Add 1 1/2 cups mozzarella in bowl.  Add in chicken and pasta, stir until well mixed.  Spoon mixture in baking dish, sprinkle evenly with remaining mozzarella.  Bake covered on 375 for 30 minutes, then uncover and continue cooking 15 minutes.  Serves 4-6.
Adapted from http://www.savingmoneylivinglife.com/