Lee McKenna of Etobicoke, Ont., makes a layered casserole of creamy mashed potatoes, spinach and squash that’s a great comfort food laced with zingy fresh ginger. She often receives potluck invitations with the request to bring “that layered thing.”
To bring it already baked, take casserole out of oven, cover with foil and lift into a heavy cardboard container with high sides for carrying. Or assemble casserole, but do not bake. Cover with foil and refrigerate for up to a half a day. At the party, bake, covered, for 30 minutes. Then uncover and continue baking until hot, about 1 more hour.