I tried the five-minute chocolate mug cake for the first time today. It was really yummy and made a large mug full of cake. I followed the recipe verbatim except I was concerned with the lack of leavening. I added about 1/2 tsp. of baking powder with the dry ingredients.

5-Minute Chocolate Mug Cake

My sister-in-law shared this on Facebook. I’m saving it here for my own personal reasons…
4 tablespoons cake flour 
4 tablespoons sugar
2 tablespoons baking cocoa
1 egg
3 tablespoons milk
3 tablespoons oil
3 tablespoons chocolate chips (optional)
A small splash of vanilla
1 coffee mug
Add dry ingredients to mug and mix well. Add the egg and mix well. Pour in the milk and oil [...]