In a 9x9 glass baking dish, pour in rice, 1/2 cup cheese, 4 tablespoons pesto, and chicken. Sprinkle chicken with salt & pepper, to taste. Pour chicken stock over all ingredients and stir gently to even out the rice underneath the chicken. Cover with foil and bake 45 minutes to 1 hour or until rice is cooked to your liking.
Remove chicken from baking dish and shred into large pieces. Add chicken back in and stir in cream, remaining pesto and 3/4 of the diced tomatoes. Spoon into 4 servings and top with tomatoes, more cheese {if desired} and Italian seasoning. Serve.