Preheat broiler. Prepare rigatoni and spinach according to package directions.
Drain pasta, leaving about 1/2 cup of pasta water in the pot; return pasta to pot. Stir in artichokes, chicken, 1/2 cup mozzarella cheese, parmesan, salt, and pepper.
Transfer to a greased 2-qt. broiler-safe baking dish; top with remaining mozzarella cheese. Broil for 2 minutes or until cheese is melted.
Notes
ROTISSERIE CHICKEN: I love using rotisserie chicken in recipes as much as I can because it makes it so much easier. This casserole is also good if you have any leftover rotisserie chicken from the night before.
NOODLES: I used Rigatoni noodles but I’ve used penne and bow tie noodles before too.
ARTICHOKE HEARTS: Make sure that you drain the artichoke hearts well. I drained mine and then patted them with a piece a paper towel to remove some of the water.