Place the sugar, cardamom pods, and water in a small saucepan and bring to a boil. Reduce to a simmer, stirring occasionally until the sugar has dissolved.

Cover the pot with a lid and remove from heat. Let the syrup cool until room temperature. Strain and pour into a sealable container.

Pour desired amount of syrup into a bowl, along with the warmed oat milk, and froth with your preferred method.

Pour a double shot of espresso into a mug and top with the frothed cardamom oat milk mixture and enjoy!