Preheat your oven to 425°F. Line a baking sheet with aluminum foil for easy cleanup.
Spread the gnocchi, cherry tomatoes, chopped bell peppers, and chopped red onion on the prepared baking sheet.
Drizzle the vegetables and gnocchi with olive oil. Sprinkle garlic powder, salt, pepper, oregano, basil, and red pepper flakes over them. Toss everything to ensure it's well coated with oil and seasonings.
Roast in the preheated oven for 20-25 minutes, tossing once halfway through, until the vegetables are tender and the gnocchi is slightly crispy.
Take the dish out of the oven, mix in the spinach leaves, and gently toss with the hot vegetables and gnocchi to allow the spinach to wilt.
Sprinkle with grated Parmesan cheese and chopped parsley; serve immediately.