Remove any outer yellow and/or discolored leaves from sprouts. Trim stems, rinse and slice in half vertically.
Toss Brussels sprouts in a large bowl with olive oil, salt, pepper and garlic powder, coating as evenly as possible.
Spread evenly on a large baking sheet in a single layer. Roast for 25 to 30 minutes, or until browned and crispy on the outside and tender on the inside (time will vary depending upon size).
Sprinkle with additional salt and pepper, if desired. Serve immediately.
Notes
To reheat, place on a baking sheet in a single layer and bake at 350 degrees F for 10 minutes, or until heated through