In a microwave-safe mug, mix together the flour, sugar, cocoa powder, and baking powder.
Add the vegetable oil and milk to the mug and mix again.
Break the chocolate bar into small pieces and add them to the mug along with 1 tablespoon of Nutella.
Without mixing, add another tablespoon of Nutella on top of the mixture.
Sprinkle 1 tablespoon of sugar and 1 tablespoon of cocoa powder on top of the Nutella.
Microwave the mug for 1 minute.
Add your favorite fruits on top of the cake.
Enjoy your yummy chocolate mug cake!
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