I used to order a shake like this from a Middle-Eastern restaurant in Cleveland back in the nineties. I have no idea if it is still there, but I owe them a debt of gratitude for introducing me to this combination.
1brown bananasliced and frozen
Add all ingredients to blender and mix on high until smooth.
Make sure you have a heavy-duty blender or else let the banana thaw slightly but not completely before blending.