Preheat oven to 400 degrees.
Place broccolini on a baking sheet. Drizzle with olive oil, season with salt and pepper. Toss well and spread vegetable in an even layer on the pan. Turn the broccolini periodically as it roasts and cook until it starts to brown and becomes golden color around the edges. This should take 15 to 18 minutes.
Serve warm or allow to cool and serve at room temperature.