Preheat the oven at 170°. Pour oil over a mixed ovenproof dish. Sprinkle with breadcrumbs.
Heat the olive oil and sauté the vegetables stirring until soften. Add the sausages.

In a bowl, beat the eggs with salt, pepper and spices. Add the sautéed vegetables, feta cheese and cheddar in cubes.
Pour over the dish and bake for about 35 ', until the omelet is stabilized. Serve with green salad.