Double Potato Gratin

1 lb. potatoes
1 lb. sweet potatoes
1 ½ - 2 C. Heavy Cream or Half and Half
1 bay leaf
1 clove minced garlic
½ C. grated parmesan
Heat cream/half and half on the stove top in a sauce pan and add bay leaf and garlic. Peel and slice potatoes into thin rounds. Add the sliced potatoes to the cream with salt and pepper to taste. Cook for 12 minutes. Pour ½ of the potatoes into a buttered baking dish and top with ¼ c. cheese. Add remaining potatoes and top with remaining cheese. Bake for 20-25 min. at 350.