To make the brown sugar syrup, combine brown sugar and water in a small saucepan. Heat over medium heat, stirring until the sugar is dissolved. Bring to a simmer and cook for 1-2 minutes. Remove from heat and let cool.
In a glass, add the cooled brown sugar syrup. Pour in the espresso shot (or strong brewed coffee).
Add oatmilk and ice if desired. Stir well and enjoy!
Notes
This recipe is easily adaptable. Adjust the amount of brown sugar syrup to your sweetness preference.