01 - Preheat oven to 400°F. Toss diced butternut squash with 1 tablespoon olive oil, salt, and pepper. Spread on a baking tray and roast for 20 to 25 minutes, stirring once, until tender and lightly caramelized.
02 - Heat remaining 1 tablespoon olive oil and 1 tablespoon butter in a medium saucepan over medium heat. Add onion and cook for 3 to 4 minutes until softened. Add garlic and thyme, and cook for 1 more minute.
03 - Stir in Arborio rice and cook for 2 minutes, stirring constantly, until the edges become translucent.
04 - Pour in white wine and simmer while stirring until mostly absorbed.
05 - Add warm vegetable broth one ladle (about ½ cup) at a time, stirring frequently and allowing most of the liquid to absorb before adding more. Continue this process for 18 to 20 minutes until the rice is creamy and al dente.
06 - Reserve a handful of roasted squash cubes for garnish and gently fold the remaining squash into the risotto.
07 - Remove from heat and stir in Parmesan cheese and remaining butter. Season with salt and freshly ground black pepper to taste.
08 - Serve immediately, garnished with reserved roasted squash and additional Parmesan if desired.