a-1575507471 2 1 Dec 04, 2019 04:57 PM Smoke Investigation Last week I had a craving for sweet potato casserole. (And, no ---- no marshmallow topping.) Unfortunately, I let mine bake for over four hours instead of the recommended 30 mins @ 350ºF. Some of the innards were salvagable and edible, but extra light and puffy. Oops.