Preheat Oven: Get your oven nice and hot by preheating it to 400°F (200°C). Line a large sheet pan with parchment paper.
Prep Sprouts: Wash your Brussels sprouts, then trim the ends and cut them in half.
Season Sprouts: In a large bowl, toss the Brussels sprouts with 2 tablespoons of olive oil, 1/2 teaspoon of kosher salt, and 1/2 teaspoon of garlic powder.
Add Cheese: Sprinkle 1/2 cup of grated Parmesan cheese over the sprouts and mix until everything is evenly coated.
Roast to Perfection: Spread the sprouts in a single layer on your prepared pan, cut-side down. Bake for 20-25 minutes until tender and golden brown.