Bring a large pot of water to a boil and season it with salt. While the water heats, dice the onion and zucchini.
When the water is boiling, cook 1lb cheese tortellini (fresh or frozen) according to package directions. Drain and set aside.
Meanwhile, heat a deep, ovenproof skillet over medium heat. Add and melt 4 cubes Italian Herb Saute Express Saute Starter.
Add the diced onion to the skillet and sauté 3 minutes, stirring occasionally. Add the diced zucchini and cook another 3 minutes, until the onion and zucchini are tender. Season with salt and pepper to taste.
Stir in the 14.5oz can petite diced tomatoes (including juices). Simmer lightly for 5 minutes.
Add the cooked tortellini and 1/2cup shaved parmesan cheese to the skillet; stir gently to combine and warm through.
Evenly sprinkle 1 1/2cups grated mozzarella cheese over the top. Place the skillet under the broiler and broil until the mozzarella is melted and bubbly, watching closely (about 2–5 minutes).
Remove from the broiler, let rest 1–2 minutes, garnish with parsley if desired, and serve hot.