Gluten-Free Brownie in a Mug

A friend of mine posted on Facebook yesterday that she had made a brownie in a mug that changed her world. I've made brownies in a mug before, but it's been a while and I have no idea where the recipes are. Myself, along with a few of her other friends encouraged her to share the recipe, and she was nice enough to do so.

She said the recipe came from the Life Hack page that has been circulating (I have no idea what this is, but I like to give credit where credit is due.)

Recipe:
In a mug, put 1/4 cup flour, 1/4 cup sugar, 2 tbsp cocoa powder, mix.
Then add 2 tbsp, and 3 tbsp water. Mix well.
Microwave 1 minute 40 seconds.

The only modification I made was using gluten-free flour rather than regular flour. I used my go-to substitute of 1-2-3 Gluten-Free Multi-Purpose Flour and followed the directions precisely.

This is what the mix looks like prior to cooking:

After the minute and forty seconds in the microwave, it still looked a little too wet, so I added another 20 seconds. 

I should have probably waited to eat it, but the idea of a brownie with a cup of coffee sounded amazing. I think it would have dried out and seemed more "brownieish" (I'm aware that's not a word) if I waited until it cooled, but I was too excited. 

I'd love to hear if anyone else tries this out. Let me know what flour you used and if you made any other modifications. 

Enjoy!