Make Cinnamon Simple Syrup (if you don't have it pre-made):
In a small saucepan, combine 1/2 cup water, 1/2 cup sugar, and 1 cinnamon stick. Heat over medium heat, stirring until the sugar dissolves. Once it reaches a simmer, remove from heat and let the syrup cool. Discard the cinnamon stick.
Prepare the Glass:
On a small plate, mix equal parts cinnamon and sugar. Moisten the rim of your glass with a lime wedge and dip it into the cinnamon-sugar mixture to coat the rim.
Shake the Cocktail:
Add the tequila, cinnamon simple syrup, lime juice, apple cider, and orange liqueur to a cocktail shaker. Fill the shaker with ice and shake vigorously for about 15 seconds until well chilled.
Serve:
Strain the mixture into your prepared glass filled with fresh ice. Garnish with a lime wedge or cinnamon stick, if desired.