Notes: You can substitute any type of vegetables and/or meat -- try to have 4 to 6 cups of fillings (plus counting the potatoes and cheese) for a nice hearty strata. Here are a few more combinations I will be trying:
-- mushrooms, spinach, roasted turkey breast, shallots, Gruyere cheese
-- asparagus, bacon, green onion, orange pepper, Havarti cheese
Also, I'm sure you could bake this the same day, just leave it sit for half an hour or so to let the bread soak up some of the liquid.