In a bowl, whisk together all-purpose flour, granulated sugar, and baking powder until smooth.
Add milk, vegetable oil, and vanilla extract to the dry ingredients and mix until well combined.
Stir in festive sprinkles and mix them into the batter.
Scoop the batter into a large mug or divide it into two smaller mugs.
Microwave on medium heat until there is no wet batter left. Be careful not to over bake.
For the icing, mix together icing sugar and milk until smooth.
Pour the icing over the warm cake and top with festive sprinkles or decorations of your choice.
Enjoy your quick and delicious Christmas dessert!
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