What you will need:

1/4 cup + 1 tbsp Nutella
2 tbsp  egg whisked
2 tbsp all purpose flour

Steps to yummy goodness:
1. Combine all ingredients into an over sized microwave-safe mug.
2. Mix with a whisk until batter is smooth. Batter will be quite thick.
3. Microwave for 1 minute. Let brownie cool and set for about 15-30 minutes before eating.

.:Side Note:.
There are lots of ways to change this by adding simple toppings like chopped up nuts (shown in photo), or try caramel. The options are endless and so easy to personalize for anyone or any occasion.