Rub the lemon wedge in a wide stripe down the side of a coupe glass. Holding the glass over a side plate, dust with chipotle chili powder to create a red stripe.
To a cocktail shaker, add rye, lemon, maple syrup, and egg white. Shake hard without ice for 20-30 seconds. Add ice and shake again for another 20-30 seconds.
Strain into prepared glass. Garnish with three drops of bitters. Enjoy!