Arrange the yams, overlapping slightly, in layers in the baking dish. Pour the syrup over the potatoes, then cover the baking dish with aluminum foil. Bake for 30 minutes, then remove the foil and ...

Finish with a layer of caramelized onions, cover dish with foil, and bake for 30 minutes. Remove the foil, and bake for another 15 to 20 minutes until the sweet potatoes are soft when tested with ...

Pour the heavy cream over the yams and potatoes. Cover the casserole with foil. Bake for 1 hour. Remove the foil from the casserole and bake until the yams are golden brown, about 20 more minutes.