Sweet potatoes slow cooked with apples and spices in the crock pot makes for a healthy vegetarian and vegan side dish sweet potato casserole perfect for thanksgiving or any chilly fall day. If your oven is full, make your sweet potatoes in the crockpot instead. You can also serve them right out of the crockpot, saving you one less dish to cleanThis sweet potato casserole with apples is both vegetarian and gluten-free. Need this recipe to be vegan? Just be sure to use a vegan butter substitute or vegan margarine.