2. Place the onions in an ovenproof dish. Bake until tender and easily pierced with a skewer, about 30 to 45 minutes depending on size. Remove from the oven and allow to cool.
3. Peel and cut the onions into 1/2" thick slices. In a large bowl, combine the onions, cream, a generous dose of the spices, green peppercorns and the chives. Lay the onions slightly overlapping in a baking dish sprayed with non-stick spray. Bake until the onions are very soft and slightly golden on top, about 30 to 45 minutes. Allow to rest for a few minutes before serving.