On a large baking sheet, spread out the sliced zucchini, chopped bell pepper, halved cherry tomatoes, and sliced onion.
Drizzle the olive oil over the vegetables and sprinkle with Italian seasoning, salt, and pepper. Toss to coat evenly.
Add the gnocchi to the baking sheet, making sure they are well mixed with the vegetables. Spread everything out into a single layer.
Roast in the preheated oven for 20-25 minutes, or until the vegetables are tender and the gnocchi are lightly golden. Stir halfway through for even cooking.
Once done, remove from the oven and toss in the minced garlic. Let it sit for about 5 minutes to allow the garlic to infuse the dish without burning.
Serve hot, garnished with fresh basil leaves and drizzled with parmesan cheese if desired.
Notes
Feel free to customize the vegetables based on your preference.