Preheat oven to 400 degrees Fahrenheit (200 degrees Celsius).
Place the refrigerated tortellini, sliced sausage, zucchini, bell pepper, and cherry tomatoes directly onto a large rimmed sheet pan.
Drizzle olive oil over the ingredients and sprinkle with oregano, garlic powder, salt, and black pepper.
Toss all ingredients on the pan until evenly coated, then spread into a single, uniform layer.
Roast in the preheated oven for 20 minutes, or until the sausage is browned and the vegetables are tender.
Remove from the oven and immediately sprinkle with grated Parmesan cheese and fresh parsley.
Serve directly from the pan or transfer to a serving platter.