Preheat the oven to 400°F to 425°F
Trim the Brussels sprouts and remove any damaged outer leaves
Rinse the sprouts and dry them thoroughly
Cut larger sprouts in half
Place the sprouts in a bowl
Add olive oil, salt, and pepper
Toss until evenly coated
Spread the sprouts on a baking sheet in a single layer
Place them cut-side down if halved
Bake for 20 to 30 minutes
Flip once halfway through if desired
Remove when tender and browned
Serve immediately