In a shaker with ice, combine Reposado tequila, Cointreau, apple cider, lime juice, and cinnamon syrup.

Shake vigorously to chill the mixture.

Strain the cocktail into a glass rimmed with agave syrup and cinnamon-sugar.

Garnish with a cinnamon stick or apple slice for an extra touch of autumn elegance.

Combine water and sugar in a saucepan over medium heat, stirring until the sugar dissolves.

Add cinnamon sticks and bring the mixture to a simmer.

Let it simmer for 10-15 minutes, allowing the cinnamon to infuse into the syrup.

Remove from heat, cool, and strain out the cinnamon sticks.