Ensure vegetables are fully prepped and dry.
Toss vegetables with desired seasoning and oil.
Coat vegetables with cornstarch (1 tablespoon per pound of vegetables).
Roast the vegetables until crispy.
Notes
If you're really in a pinch, you could try all-purpose flour. However, your veggies probably won't be as crispy. For this alternative, you are going to need twice as much flour (so about 2 tablespoons per pound of vegetables).
