Grilled Pizza with Crispy Mushrooms and Shallots

fresh shiitake mushroom stems removed, caps wiped clean with a damp towel, quartered

medium uncooked shallot(s) peeled, quartered and chopped

olive oil

table salt

spray(s) cooking spray

cup(s) store-bought pizza sauce or tomato sauce

medium whole wheat tortilla(s)

dried oregano

pound(s) Provolone cheese about 4 thin slices

grated Parmesan cheese Parmigiano-Reggiano recommended