Bring a large pot of water to a boil and season with salt.
While the water heats, heat a deep skillet over medium heat and add the 4 cubes of Italian Herb Saute Express; melt or sauté as package directs.
Add the diced onion to the skillet and cook about 3 minutes until starting to soften.
Stir in the diced zucchini and cook another 3 minutes until the onion and zucchini are tender.
Salt the boiling water and cook the tortellini according to package directions; drain and set aside.
Add the can of petite diced tomatoes to the softened vegetables, season with salt and pepper to taste, and simmer gently for about 5 minutes.
Stir the cooked tortellini and the shaved Parmesan into the tomato-vegetable mixture until combined.
Sprinkle the grated mozzarella evenly over the top and place the skillet or transfer to a broiler-safe dish under the broiler until the cheese is melted and bubbly, watching closely to avoid burning.
Remove from heat, garnish with parsley if using, and serve hot.