Peel the sweet potatoes then slice them to ⅛ inch thick on the mandolin slicer. Layer the sweet potatoes in the bottom of the pan slightly overlapping each other.
Stir the cream then ladle a small amount of cream sauce over the potatoes and sprinkle them lightly with Romano cheese. Continue this process until all sweet potatoes and cream are used.
Sprinkle the remaining Romano over the top of the dish then bake for 40 minutes, uncovered. Place aluminum foil over the top of the dish then continue baking another 15 minutes.