For the brown butter syrup: Melt 1 tbsp butter, ¼ cup brown sugar, ¼ cup water, and a dash of cinnamon.
Blend the banana, cinnamon, and brown butter syrup until creamy.
Add the maple syrup, sea salt, vanilla bean paste, and espresso, then shake until light and foamy.
Add ice and oat milk to a glass.
Pour in the banana bread mixture.
Top with the shaken espresso.
