Prep the brussels sprouts. Wash them with cold water in a large colander, then drain and pat them dry thoroughly. Now cut off the bottoms and slice each Brussels sprout in half lengthwise.
Roast them. Transfer the seasoned Brussels sprouts onto a rimmed sheet pan and place them cut side down. Then cook them for 20-25 minutes in the oven at 400 degrees Fahrenheit, or until they are crisp and browned on the outside and tender on the inside. Serve.