In a mixing jar or blender jar or deep bowl, add chopped banana and chocolate syrup (I had used Hershey's chocolate syrup. However if you do not have chocolate syrup then use 2 tsp of cocoa powder and 2 tsp sugar instead).
Add 100 ml of milk to it.
Blend everything smooth.
Add remaining milk and blend everything well. If you want chilled milk shake then add 2-3 ice cubes while blending.
Take the serving glass. Decorate it by pouring chocolate syrup on the inner edges .
Pour the prepared choco banana shake and sprinkle some grated chocolate on it an serve. I had serve the shake to my son as his after school snack with homemade healthy soft cookies.