Try to get tomatoes, onion, and eggplant about the same size round. Arrange slices of eggplant, onion, and tomato in a stack. Top with a pat of butter, salt, pepper, and basil. Bake covered for 20 minutes at 350. Uncover and place a slice of mozzarella on each stack and a bit of breadcrumbs. Return to oven for 10 minutes. This is a great side dish with any meat. Also great served with spaghetti and meat sauce.