Sprinkle the chicken breasts with a little salt. Bake the chicken breasts on a large rimmed baking sheet covered with foil for 30 minutes until the chicken is 160 degrees. Remove from the oven and drain the cooking liquid.
Meanwhile, combine the cream cheese, artichokes, parmesan, spinach, and seasonings. Mix well. Set aside.
When the chicken is fully cooked let it cool until you can handle it. Cut each piece through the center into two thin pieces.
Put them back on the baking sheet. Divide the topping between them. Sprinkle with the mozzarella cheese.
Bake for an additional 10-15 minutes until the topping is hot and golden.