Whisk together the egg, milk, cinnamon, nutmeg, vanilla and sugar in a large bowl.
Dip the bread in the custard, both sides and let milk soak for 15 seconds then remove and let drip for 5 seconds before adding to pan.
Add the butter to a heavy bottomed skillet over medium-high heat before adding the bread in and cooking until browned on both sides, about 2-4 minutes per side.
