Turn on your waffle iron and allow to heat up.
Slice the Panettone thickly, as you would a loaf of bread (ideally 2-3cm thick)
Melt the butter in a small container in the microwave and stir through the cinnamon. Brush the cinnamon butter on each side of the Panettone slices.
Cook each slice of Panettone in the waffle iron until golden brown and crispy.