Prep the vegetables: Trim the brussels and cut in 1/2. Peel the carrots, Split lengthwise, and cut at a steep angle to make long pointed sticks. Cut the romescu into florets about an inch to an inch and a half.
Toss each of the vegetables separately in oil, salt, and pepper. Spread out evenly on sprayed sheet pans.
bake for about 10 minutes until slightly browned on the edges. They should be al dente with their colors still somewhat intact. Serve immediately.