Preheat the oven to 400°F to 425°F
Trim the Brussels sprouts and remove any yellow outer leaves
Cut larger sprouts in half
Pat the sprouts dry
Place the sprouts in a bowl
Add olive oil, salt, and black pepper
Toss until evenly coated
Spread the sprouts on a baking sheet in a single layer
Place cut sides down if halved
Roast for 20 to 30 minutes
Flip halfway through if desired
Roast until browned and tender
Serve immediately