01 - Preheat oven to 400°F. Toss diced butternut squash with 1 tablespoon olive oil, salt, and pepper. Spread evenly 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 chopped onion and cook for 3 to 4 minutes until softened. Stir in minced garlic and thyme; cook for an additional minute.
03 - Add Arborio rice to the saucepan and cook, stirring constantly, for 2 minutes until edges become translucent.
04 - Pour in the dry white wine and simmer, stirring, until mostly absorbed by the rice.
05 - Add warm vegetable broth one ladle (about 1/2 cup) at a time, stirring frequently. Wait until the liquid is mostly absorbed before adding more. Continue this process for 18 to 20 minutes, until rice is creamy and al dente.
06 - Set aside a handful of roasted squash cubes for garnish. Gently fold the remaining squash into the risotto.
07 - Remove the saucepan from heat. Stir in Parmesan cheese and remaining butter. Adjust seasoning with salt and pepper to taste.
08 - Serve immediately, garnished with the reserved roasted squash and extra Parmesan if desired.