RIM GLASSES. Mix equal parts kosher salt, granulated sugar, chili powder and pumpkin pie spice on a small plate. Wet glass rims and dip in seasoning. I typically just wet glasses with water, but depending on the type you're using a simple syrup or agave sweetener could also work as a sticky rim adhesive. If you don't like heat just skip adding the chili powder! For a similar alternative to pumpkin pie spice you can use cinnamon or cinnamon sugar.
MAKE COCKTAIL. Fill cocktail shaker with ice and add all ingredients. Shake vigorously to combine and strain into rimmed glasses. Can be served with or without additional ice.
OPTIONAL GARNISH. Feel free to garnish with lime wedges, a cinnamon stick or extra jalapeños depending on your taste preference.