Spray a nonstick cookie sheet with cooking oil spray. In a low wide bowl, stir together breadcrumbs, Parmesan cheese, and paprika until well mixed. Place sliced zucchini, onion rings, or cauliflower in a mixing bowl and drizzle vegetables with salad dressing. Toss vegetables until coated. Then, roll vegetables in crumb mixture until coated. Place the coated vegetables in a single layer on the prepared cookie sheet. Bake vegetables in a 450 degree F oven for 10 to 11 minutes or until golden. Turn once during baking. Serve with fat free ranch dip for dipping.