Gryphon's Aeire
When I need to coat vegetables with oil before grilling or roasting, I put a little oil (1-2 tablespoons, depending on how many vegetables) with a little salt and pepper and/or other seasonings in a resealable bag along with the vegetables (asparagus, mushrooms, onions, potatoes, summer squash, zucchini, etc.) and shake the bag. I use much less oil this way and the vegetables tend to be much more uniformly coated.