Begin by peeling and slicing 2-3 ripe bananas to unlock their natural sweetness. Gather other ingredients.

In a high-speed blender, combine the sliced bananas, 1 cup of whole milk, 2 tablespoons of sweetened condensed milk, and 1 teaspoon of vanilla extract. Blend on high for about 30–60 seconds until smooth.

If desired, strain the mixture through a fine mesh sieve into a pitcher for an ultra-smooth texture.

Pour the creamy Korean banana milk into chilled glasses. Add ice if desired and garnish with banana slices or cinnamon.

Store any leftovers in a sealed jar in the refrigerator for up to 2 days. Shake before serving.