Set the oven to 325°F / 163°C and leave it for 15 minutes so the rack is actually hot. Weigh green beans, cremini mushroom, whole milk, all-purpose flour, unsalted butter, shallot, fresh thyme, kosher salt. Green bean casserole is cooked in Thanksgiving as its own plate, not as a copy of a restaurant menu. Blanch the beans, fold them into a mushroom milk sauce, and bake until the top browns. Amounts are for 4 from foods this library can count.
