Heat the oil in a 12-inch skillet over MEDIUM heat. Add the onion, zucchini, and garlic and sauté for a couple of minutes, or until the onion is slightly softened and the zucchini is fork tender. Add the beef and cook, stirring to break it up, until fully cooked.

Drain off as much grease from the pan as possible and return it to the heat. Sprinkle the beef with the Italian seasoning, salt, and pepper. Add the diced tomatoes, tomato sauce, beef broth, mushrooms, and dry pasta to the pan. Stir to combine and bring it to a boil. Cover the skillet, reduce the heat to LOW and simmer for 15 minutes or until the pasta is al dente.

Stir in the basil and sprinkle the mozzarella and Parmesan over the top. Cover and cook just until the cheese is melted. Alternately, you can set your oven to BROIL and place the skillet in the oven for a minute or two, until the cheese has melted.