Preheat the oven to 425°F (220°C). Line a large baking sheet with parchment paper or lightly grease it.
In a large bowl, toss the sliced squash with olive oil, garlic powder, salt, and pepper until evenly coated.
Spread the squash in a single layer on the prepared baking sheet. Avoid overcrowding.
Roast in the oven for 20-25 minutes, flipping once halfway through, until tender and lightly golden.
Sprinkle with Parmesan cheese if desired, and serve warm.