Preheat the oven to 425° F. Allow the oven to fully preheat. Arrange your rack in the middle position.
Wash and adequately pat dry the vegetables (dried vegetables will roast much better, so be sure to limit moisture). Peel if desired/needed and chop or slice into fairly uniform pieces.
Arrange the vegetables in a single layer on the baking sheet, being mindful not to crowd the pan. Crowded vegetables will not roast but rather will end up steaming.
Drizzle or brush the vegetables with olive oil (or other oil of your choice) and toss well to coat evenly.
Season with salt, freshly ground black pepper, and herbs and or spices, if desired.
Roast in the preheated oven for the appropriate time (see above suggested times), check and stir halfway through cooking.
Roast until the vegetables reach your desired degree of doneness and caramelization. Pierce with a knife or fork to determine that tenderness.