Thinly slice ripe tomato, yellow onion and zucchini. Bake in a covered dish at 400 degrees for 20-25 minutes. Remove cover and sprinkle cooked mushroom and veggies with a layer of cheese. Bake 3 minutes and serve. I lightly salted the tomatoes before adding the layer of onions and used extra sharp cheddar cheese. Hubby was very happy with dinner tonight. The parsley in the photo is from the garden.