Wet the rim of your glass with water or a lime wedge and roll it over the cinnamon sugar mixture to coat.
Make the cocktail
Add lime juice, tequila, Cointreau or triple sec, pumpkin puree, pumpkin spice or cinnamon, and maple syrup (optional) into a cocktail shaker. Seal and shake vigorously.
Serve
Strain cocktail into the prepared glasses and enjoy!
Notes
If making your own cinnamon sugar, combine 1 tablespoon of brown sugar and ¼ teaspoon of cinnamon in a small dish.