Add all ingredients into a blender with 1 cup of ice and blend until smooth.
Pur into a copper Julep mug.
Garnish with bourbon-flambéed banana slices, a mint sprig and powdered sugar.
*Bourbon-flambéed banana slices: Sauté banana slices in a pan, add a little whiskey, then ignite to burn off alcohol. Alternatively, use a kitchen torch on sugar-coated banana slices for more caramelized flavor.