Mix cinnamon with sugar. Roll each roll into a 9-inch rope. Tie in a loose knot. Roll each knot in melted butter and then cinnamon/sugar mixture.
Place in a sprayed muffin tin. Cover with sprayed plastic wrap and let double in size.
Remove wrap. Bake at 350°F 15-20 minutes or until golden brown. Remove from pan and place on a cooling rack. Brush with icing while still warm.