# Directions:
01 - Combine brown sugar and water in a small saucepan over medium heat. Stir continuously until sugar dissolves completely. Remove from heat and incorporate cinnamon and vanilla extract. Allow to cool.
02 - Prepare a fresh shot of espresso or brew strong coffee.
03 - Add ice cubes to a cocktail shaker or a large jar with lid.
04 - Pour 1 to 2 tablespoons of the cooled brown sugar syrup, espresso, and chilled oat milk into the shaker.
05 - Secure lid tightly and shake vigorously for 15 to 20 seconds until chilled and frothy.
06 - Strain the mixture into a tall glass filled with fresh ice cubes.
07 - Optionally, sprinkle a pinch of cinnamon on top before serving.