Start by trimming the ends and scoring each onion with a small “X.” This helps the skins slip off after blanching. Quick boiling for about a minute loosens those skins so you can peel them with your fingers without fuss.
Place the peeled onions in your saucepan, then pour in the heavy cream and chicken stock. Add the bay leaf and bring to a gentle simmer. This slow heat lets the onion flavors deepen while the sauce begins to thicken.
Let the mixture cook until the cream reduces to a rich, silky sauce—about 20 minutes. Season with salt and freshly ground pepper, remove the bay leaf, then stir in chopped parsley for color and freshness.