01 - Preheat oven to 400°F. Toss diced butternut squash with 1 tablespoon olive oil, salt, and pepper. Spread evenly on a baking sheet and roast for 20 to 25 minutes, turning once, until tender and golden. Remove and set aside.
02 - Heat 2 tablespoons butter and 1 tablespoon olive oil in a large sauté pan or Dutch oven over medium heat. Add sage leaves in a single layer and fry for 1 to 2 minutes until crisp. Remove with a slotted spoon and drain on paper towels.
03 - In the same pan, add chopped onion and cook over medium heat for 4 to 5 minutes until soft and translucent. Stir in minced garlic and cook for 1 minute.
04 - Add Arborio rice to the pan and cook for 2 minutes, stirring constantly until grains become glossy and well coated.
05 - Ladling in warm vegetable stock one cup at a time, stir continuously until each addition is absorbed before adding the next. Continue this process for 18 to 20 minutes until rice is creamy and al dente.
06 - Gently fold roasted butternut squash into the rice. Stir in the remaining 2 tablespoons butter and grated Parmesan. Season with salt and freshly ground black pepper to taste.
07 - Plate risotto immediately and top with crispy sage leaves. Optionally, sprinkle additional Parmesan before serving.