Bring one cup of water to boil in a small saucepan. Add the brown sugar, whisk to combine, return to a boil to dissolve sugar, then remove from the heat and allow to cool. Yields 12 ounces.
For ONE Iced Brown Sugar Oat Milk Shaken Espresso
In a jar with a lid (a 16 ounce mason jar works well) combine espresso, simple syrup and cinnamon. Shake well. Fill a tall glass 3/4 full of ice. Pour espresso mixture over ice, top with oat milk. Stir to combine.
Notes
For fun I calculated what this cost me to make at home. Here's the breakdown.
$2.00 2-coffee pods/capsules
$0.06 1 ounce brown sugar simple syrup
$0.01 1/8 tsp. cinnamon
$0.30 1/2 cup OAT-LY! oat milk
$2.37 for a Grande Iced Brown Sugar Oat Milk Shaken Espressovs. Starbucks grande @$5.95