In a small mixing bowl, whisk together the Nutella, egg, and milk until combined.
Add the flour and and mix in until completely combined.
Add the mixture to two small microwave-safe mugs or two small ramekins, and heat for 45 - 50 seconds (800W) - mine was done in 50 seconds.
Top with extra Nutella, or a scoop of ice cream. Serve and enjoy!
Video
Notes
I used 4-oz ramekins for this recipe.All microwaves are different and can yield different results (like a burnt, tough cake). My microwave is 800W and I cooked mine on 100% power for 50 seconds. Knowing this may help you better judge how long to cook yours for.I recommend checking on the cake after the 30 second mark.