Mix flour, sugar, cocoa, baking soda, and salt in a mug.
Mix in 1 Tablespoon of Yogurt. If too thick, add 1 more Tablespoon and mix until you get a brownie batter consistency.
Mix in desired amount of your favorite chocolate chips (use semi-seeet or dark chocolate for a bit of a healthier alternative) this step is optional! If you have a different toppings you like to put in your brownies, add it now.
Microwave for 1:10 Seconds. All microwaves are different, so time may vary.
Sprinkle some more chocolate chips (or other topping) on top. (Optional).