Set out your bread, egg, milk, and spices so everything is within arm's reach.

Crack the egg into a shallow bowl and whisk in the milk, vanilla extract, cinnamon, nutmeg, and salt using a fork for about 30 seconds until smooth.

Place your skillet over medium heat and let it warm for 1 to 2 minutes.

Add the butter and swirl it around until it foams and turns golden.

Dip one slice of bread into the custard mixture for about 1 second per side.

Place the coated bread into the skillet and cook for 2 to 3 minutes until the bottom is deep golden brown.

Using a spatula, carefully flip the slice and cook the other side for 1 to 2 minutes.

Transfer your cooked slice to a plate and repeat the soaking and cooking process with the second slice of bread.

Arrange both slices on a plate and top with your favorite additions while warm. Serve immediately.