In a medium bowl, combine the eggnog, eggs, and cinnamon. Whisk until everything is combined and cohesive.
Place one slice of bread into the mixture long enough to soak the side, then flip the bread and allow it to soak for an additional 3 seconds.
Cook:
Melt 1 tablespoon butter in the pan and place 2 slices of bread into the center of the pan. Cook for 3 to 4 minutes or until golden brown.
Using a spatula, flip the French toast pieces and brown the other side for an additional 3 to 4 minutes or until golden brown. Remove from the pan and repeat with remaining bread slice and butter.
Notes
Make this recipe dairy-free by omitting the butter and using cooking spray to grease the pan, and use a store-bought or this homemade dairy-free eggnog recipe.