Sift flour, baking powder, and cocoa powder 2-3 times. This is a very important step in this brownie I experienced during the trial. While adding Nutella dry flour mixture should be airy otherwise lumps will remain as it is.

Now mix all ingredients in a mixing bowl nicely till Nutella mixed with other ingredients.
Pour this batter in a microwavable bowl, a bigger version of a mug.

Bake for 2-3 minutes. Checks after 1 minutes and then bake for 30 seconds. Check again and bake for another 30 seconds.
Eggless whole wheat Nutella chocolate brownie is ready to serve with your vanilla ice cream or you can have it with coffee in evening snack.