I really wanted something sweet this evening. Due to someone (Wanda) eating all of the cookies, there was nothing in the house*.
Luckily, a couple of days ago I saw an article on how to make a cake in a mug on wikihow. Today I made a cake in a mug. I went for the second recipe. It puffed up while cooking, then went back down.
* In the interest of full disclosure, she is the one who makes the cookies