Scalloped Sweet Potatoes Au Gratin

Scalloped Sweet Potatoes Au Gratin is a terrific sweet potato casserole that can be served as a vegetarian main dish with a salad or as a side. The thinly sliced sweet potatoes are layered with a leek, Gruyere cheese, and bread crumbs. The bread crumbs create a golden-brown crust on the top of the casserole and give it a slight crunch.