If the cranberry mixture gets too thick, add a tablespoon of water and whirl it around in the food processor. You can also make this in an 8-inch springform pan; it'll be very full, so you should cook over a foil-lined baking sheet. Cook time will be the same.
These toasts are best slightly warm, so hold off on toasting the bread until just before serving. You can use cremini mushrooms if you can’t find the exotic varieties listed below.
