To a blender, add the frozen bananas, light rum, dark rum, orange juice, lime juice, powdered sugar, banana liqueur, and 1 cup of ice cubes. Blend until smooth.
Add more ice cubes and blend again to thicken, if desired.
Pour into glasses and garnish with a lice slice and banana slice. Serve immediately.
Notes
Try substituting coconut rum, spiced rum, or banana rum for fun flavor twists!Depending on the size of your glass, you may get 3 cocktails from this recipe.