Preheat oven to 400 degrees F. Line half sheet with silicone mat or unbleached parchment paper.
Trim the ends and remove outer leaves from brussels sprouts. Place on baking sheet, drizzle with olive oil, sprinkle with salt and pepper.
Stir with spatula and shake the tray to evenly coat in seasonings. Spread evenly, not touching or overcrowding the sheet. Bake for 40 minutes, shaking a few times after the 30 minute mark.
Remove from the oven, toss with Parmesan cheese and serve.
Notes
Store: Refrigerate leftovers in an airtight container for up to 2 days. Do not freeze.
Dark color baking sheet: Cooks faster than aluminum sheet pan. I used aluminum lined with silicone baking mat.
Cut in even sizes: This may mean a larger sprout needs to be cut into halves.
Lemon: Before tossing with Parmesan cheese, squeeze fresh lemon over the sprouts.
Add some garlic: Add 3-4 minced garlic cloves or garlic powder when roasting for a garlic parmesan roasted version!