Bring a large pot of salted water to a boil for the tortellini.
While the water heats, dice the onion and zucchini.
Heat a deep skillet over medium heat and add the Italian Herb Saute Express cubes; melt and heat briefly according to package directions.
Add the diced onion to the skillet and sauté for about 3 minutes until beginning to soften.
Stir in the diced zucchini and continue cooking another 3 minutes until both onion and zucchini are tender.
Salt the boiling water and cook the tortellini according to package instructions until al dente; drain and set aside.
Add the canned petite diced tomatoes to the skillet with the vegetables, season with salt and pepper, and simmer gently for about 5 minutes.
Stir the cooked tortellini and shaved Parmesan into the tomato-vegetable mixture until combined.
Transfer the mixture to an ovenproof baking dish if your skillet is not broiler-safe. Sprinkle the grated mozzarella evenly over the top.
Place under the broiler until the mozzarella is melted and bubbly, watching closely to avoid burning.
Garnish with parsley if using and serve hot.