Bake 3 large sweet potatoes until tender. When cool enough to handle, peel and maish. Cream butter and sugar and add beaten eggs. Stir in potaotes and remaining ingredients except marshmallows. Blend well. Pour into greased baking dish. Bake at 375 degrees for 20 minutes. Remove and top with marshmallows. Reduce oven to 300 degrees and return to oven until tops of marshmallows are browned.