Preheat the oven to 375 degrees.
Melt the butter in a skillet over medium heat.
Add the minced garlic, mushrooms and zucchini and cook the vegetables over medium heat for 8-10 minutes, until softened.
Mix together the tortellini, sauce, garlic, mushrooms, zucchini, italian seasoning, parmesan cheese, and salt to taste.
Grease a small baking dish and add the tortellini mixture.
Top the tortellini with the shredded mozzarella and cover the top with aluminum foil.
Bake the tortellini at 375 degrees for 30 minutes or until the cheese is melted and is bubbly.
Optional: remove the foil and broil for 1-2 minutes at the end to brown the cheese on top. Watch closely to avoid burning.