Set it to 400°F (200°C). This is the sweet spot for roasting sprouts until crispy.
Wash them well, trim off the tough stem ends, and cut each sprout in half. If some are very large, cut them into quarters so they cook evenly.
Place the sprouts in a large mixing bowl. Add the olive oil, Parmesan cheese, breadcrumbs, garlic powder, salt, and pepper. Toss everything until each sprout is coated.
Line a baking sheet with parchment paper or spray it lightly with cooking spray. Spread the sprouts in a single layer so they roast instead of steam.
Place the tray in the oven and roast for about 15–20 minutes. After that, give them a quick toss so all sides brown evenly.
Return to the oven for another 10–15 minutes until the edges are golden and crispy. Keep an eye on them toward the end so they don’t burn.
Take the tray out, let the sprouts sit for a few minutes, then serve them warm. The Parmesan will be crisp and the sprouts will have that perfect crunch.