Preheat the oven to 180ºC . In a large heavy skillet, spray cooking spray (or you can just use water if you prefer), and place over moderately high heat until hot, but not smoking. Saute onions, stirring occasionally, until they are soft. In a large bowl, whisk together the eggs, bread crumbs, parmesan, parsley, and onions until mixture is just combined. Transfer to 25 cm pie plate which has been sprayed with non-stick cooking spray. Bake the pie in the middle of the oven for 30-35 minutes, or until a tester comes out clean. Makes 6 servings.