Preheat the oven to 400 and lightly grease a baking sheet, or line with parchment.
Place the Dijon, maple syrup and balsamic (using more to taste if you like) at the bottom of a medium bowl and toss the broccolini well to coat it well with the flavors.
Place it in one layer on the parchment and roast for about 7 minutes until sizzling.
Enjoy!