Food Hacks: Microwave an Instant Chocolate Cake in a Coffee Mug

Sate your afternoon sugar cravings with a dead-easy chocolate cake recipe that only requires hot chocolate mix, flour, an egg, cooking spray, and oil (all stuff you've got in your pantry anyway). Grab the biggest microwavable coffee mug you've got in your cupboard, and cover the inside with cooking spray.
Sounds interesting, isn't it?