1 garlic clove, minced
3 tbsp. unsalted butter
1 tbsp. flour
1 c. heavy cream
4 sweet potatoes (2 1/4 lbs.), peeled & cut crosswise into 1/4 inch thick rounds
1/4 c. fine fresh bread crumbs
1/4 c. Parmesan cheese

In a small skillet cook the garlic in 2 tablespoons butter over low heat, stirring until it is softened, add flour and cook stirring for 3 minutes. Stir in cream and bring mixture to a simmer, stirring occasionally. Arrange potatoes in layers in a well buttered 11 1/2 inch gratin dish, seasoning them with salt & pepper. Pour cream mixture over them and bake in 325 degree oven for 1 hour or until potatoes are tender. Remove gratin from oven and sprinkle bread crumbs and Parmesan cheese on top. Drizzle with remaining 1 tablespoon melted butter. Bake in 325 degree oven for 15 minutes more. Put under preheated broiler about 4 inches from heat for 1 to 2 minutes or until top is browned.