Pre-heat oven to 400°.
Lightly grease a cookie sheet with olive oil.
Peeling off 2 to 3 of the dark outer leaves on the Brussels Sprouts; trim stem ends.
Place Brussels sprouts olive oil, salt, and pepper in a reusable plastic bag.
Seal and shake the bag to coat the sprouts
Place marinated Brussels sprouts onto the greased baking sheet.
Roast in oven oven 25 minutes, turning over sprouts halfway through for even cooking.
You can also spritz with a little balsamic vinegar before serving for added flavor.