Heat oil in sauce pan, add onions and garlic and oregano. When onions are soft add tomatoes. Cook for 10 minutes on medium heat.
Meantime, place sliced bread on a cookie sheet and bake in 350 degree oven for 10 minutes till toasted
Place 1/2 of toasted bread in the bottom of a soufflé dish. Sprinkle 1/2 of the Parmesan Cheese over toasts. Cover with 1\2 of the Tomatoes and 1/2 of the basil.Add another layer of toast, cheese and cover with tomatoes and the balance if the basil.
Cover with foil and bake in 350 degree oven for 40 minutes.