Over medium high heat, using an oven safe skillet, heat the oil, garlic, oregano, and salt for about 1 minute. Add the spaghetti sauce, water, chicken broth, and pasta, stirring to combine it well. Bring the mixture to a boil, then reduce heat to medium low, cover, and cook for 15 minutes, stirring occasionally. Preheat the oven to 475. When the pasta is tender, add the parmesan cheese, pepper, and chicken, and stir to mix well. Sprinkle the top with the mozzarella cheese. Put the skillet into the preheated oven and bake for 10 minutes or until the cheese is melted.