If you can find them (we can't get them here any more) you can use 2 or 3 cans of pearl onions instead of cooking reg. white onions)
Cover with water and a dash salt and boil until just tender. Drain into a colander over a large bowl and reserve 1/4 cup of the liquid.
Butter 3 slices of bread and cut into cubes, place over onions butter side up in a single layer and bake at 350 for 25-35 minutes until bread cubes are crisp and lightly browned and sauce is bubbly.