Preheat oven to 425 degrees.
Rinse broccolini and pat dry, trim edges and split any thick stalks in half lengthwise for more even cooking.
On a rimmed baking sheet, add broccolini and toss with olive oil. Season with salt and pepper and toss with shallots and garlic. Spread them in a layer so they can cook evenly.
Roast for 10-15 minutes. They will be tender crisp when done, if you prefer softer, cook a few minutes longer. Toss everything together one last time and serve hot.