One-Pot Chicken Parmesan Pasta

2–3 boneless, skinless chicken breasts, diced into bite-sized pieces
1 tsp Italian seasoning
1/2 tsp garlic powder
1 medium yellow onion, minced
3 cloves garlic, minced
16 oz dried short-cut pasta (e.g., rigatoni)
24 oz jar of marinara sauce (e.g., Newman’s Own)
Water to fill the empty marinara sauce jar
1 cup mozzarella cheese, shredded
1/2 cup Parmesan cheese, grated
Salt and pepper, to taste
Additional dried Italian seasoning, optional
Fresh parsley and/or basil, minced for garnish