Add whiskey, maple syrup, lemon juice, egg white and orange bitters to a cocktail shaker with no ice.
Put on the cocktail shaker top and shake for 30 seconds. This is our dry shake, and it helps build that frothy topping.
Remove the top and add a handful of ice. Put the top back on and shake again for at least one minute to develop the frothy topping. This is our wet shake.
Strain into a chilled serving glass. A sour glass is perfect, but if you don't have one, a couple glass, martini glass or even an old fashioned glass works.
If desired, garnish with a lemon twist. This step is optional, but it does add an elegant touch for extra fun sipping.