I came up with this last night, and it was a success- and very quick and easy.
zucchini, sliced into rounds (we used 2 medium-sized, and didn't have any leftovers)
non-stick cooking spray
Spray a saute pan with spray; place zucchini in pan and add enough Italian dressing to coat. Saute for a couple of minutes, then either keep in pan if it's oven-proof or transfer zucchini to baking dish. The dish should be large enough for most of the zucchini slices to lay in single layer. Sprinkle with Parmesan cheese as desired; place under broiler until cheese is lightly brown.
Serve immediately - the zucchini will get too soft if left under broiler too long.