Preheat the oven to 425°F (220°C).
On a large sheet pan, combine the gnocchi, cherry tomatoes, bell pepper, zucchini, and garlic.
Drizzle with olive oil and sprinkle salt, pepper, and oregano over the mixture.
Toss everything together until well coated, then spread out in an even layer.
Roast in the oven for 25-30 minutes, stirring halfway through.
Remove the sheet pan from the oven and sprinkle with Parmesan cheese.
Return to the oven for an additional 5 minutes, until the cheese is melted and bubbly.
Serve hot, garnished with fresh herbs if desired.