Sauté the onions, zucchini and olive oil in a stove top pan for 5 minutes.
Cool zucchini and onions for 5 minutes
Lay three piece of cheese to the bottom of the tart
Next, add sautéed zucchini and onions on tops of the cheese.
Add three slices of deli chicken breast
Top with the remainder of the zucchini and onions
Add 4-5 slices of the thinly sliced ham
Add three more slices of cheese.
Top with three tomato slices and salt and pepper.
Bake uncovered at 350° for 20 minutes.