01 - Preheat oven to 425°F (220°C). On a large baking sheet, combine gnocchi, butternut squash, and sliced red onion. Drizzle with olive oil, sprinkle with kosher salt and black pepper, and toss to coat evenly.
02 - Roast in the preheated oven for 20 to 25 minutes, stirring once halfway through, until the gnocchi have crisp edges and the butternut squash is tender.
03 - While the gnocchi and vegetables are roasting, melt the unsalted butter in a small skillet over medium heat. Add the fresh sage leaves and cook until the butter is browned and fragrant, and the sage leaves are crisp.
04 - Once roasted, remove the baking sheet from the oven. Drizzle the brown butter and crisp sage mixture over the gnocchi and vegetables. Sprinkle with grated Parmesan cheese and toss gently to combine.
05 - Serve immediately with fresh lemon wedges for squeezing over the dish.