In a 14 oz. mug, add in the butter. Place into the microwave for 30 seconds.
Add in the vanilla extract, sugar, flour, hot cocoa mix, cocoa powder, baking powder, milk and mallow bits.
Stir until the mixture comes together and most of the lumps are gone.
Place into the microwave for 1 minute 30 seconds to 1 minute 45 seconds. I've had the best luck with 1 minute 45 seconds.
Let cool for a minute or two.
Grab a spoon and enjoy!
Notes
Reserve a spoonful of mallow bits to add to the top of the batter just before microwaving. This will ensure that there will be mallow bits at the top of the mug cake.This mug cake is best consumed within 1 hour of microwaving.