Firstly chop the bananas into small pieces.
Now take a mixer grinder jar and add the bananas to it.
Add 2 cup cold milk to it.
Add one tablespoon vanilla essence to it.
Finally add 4 tablespoon sugar to it.
Keep it aside.
Now give it a good blend in the mixer grinder.
Your thick banana shake it ready to be served. Garnish it well wit chocolate chips or choco powder.