01 - Preheat oven to 400°F. Toss diced butternut squash with 1 tbsp olive oil, salt, and pepper. Spread on baking sheet and roast for 20–25 minutes, turning once, until tender and golden. Set aside.
02 - In a large sauté pan or Dutch oven, heat 2 tbsp butter and remaining 1 tbsp olive oil over medium heat. Add sage leaves in a single layer and fry 1–2 minutes until crisp. Remove with slotted spoon and drain on paper towels.
03 - Add chopped onion to the pan and cook over medium heat for 4–5 minutes until soft and translucent. Stir in minced garlic and cook for 1 minute.
04 - Add Arborio rice to pan and cook 2 minutes, stirring frequently until grains are glossy and coated.
05 - Ladle warm vegetable stock into rice, stirring constantly until absorbed. Repeat adding one ladle at a time, allowing absorption between additions, for about 18–20 minutes until rice is creamy and al dente.
06 - Gently fold roasted butternut squash into the rice. Stir in remaining butter and grated Parmesan cheese. Season with salt and freshly ground black pepper to taste.
07 - Plate the risotto and top with crispy sage leaves and extra Parmesan if desired. Serve immediately.