This is my favorite recipe for candied yams, Momma would add marshmallows but I think they were much too sweet.
Slice 6 cooked sweet potatoes into a baking dish. Pour over syrup made by bringing to boil 1 cup brown sugar (packed), 1/4 cup each butter, water, 1/2 teaspoon salt. Bake in mod. over (350 degrees) about 30 minutes, basting occasionally. 6 servings
This recipe came from one of the Betty Crocker's cookbooks which has fallen to pieces but I do continue to refer to this wonderful basic cookbook.