Cook and drain the whole-grain pasta according to package directions. Meanwhile in a nonstick skillet, heat the vegetable broth over medium heat (you could also use a little tomato juice in its place). Add zucchini, carrots, mushrooms, peppers, onion and garlic. Cook 5-7 minutes, stirring frequently, until veggies are crisp-tender. Stir in remaining ingredients. Cook another 3-5 minutes, stirring occasionally until hot. If using fresh basil or baby spinach, stir in now, just for a minute or 2, enough for the leaves to wilt. Then serve over the penne. This recipe makes 5 1/2 cups of sauce.