Preheat your oven to 425°F (220°C). Spread the spiralized butternut squash noodles evenly on a large baking sheet. Add the minced garlic (if using), dot or drizzle with butter or olive oil, and sprinkle with kosher salt and ground black pepper. Toss everything well to coat the noodles.
Roast the prepared butternut squash noodles in the preheated oven for 10-15 minutes, tossing halfway through the cooking time, until the noodles are fork-tender and golden in some spots. Adjust the roasting time depending on how soft you prefer your noodles. I like to toss midway so the garlic and butter coat everything evenly.
Transfer the roasted butternut squash noodles to a serving dish. Top generously with freshly shredded parmesan cheese and a sprinkle of chopped parsley. For extra flavor, I always add a little extra parmesan at the end.