Add the flour, sugar, and baking powder to the mug.

Stir to combine the dry ingredients.

Then mix in the milk, vegetable oil, and vanilla.

Stir until smooth with no lumps. Add sprinkles to the top of the cake.

Heat in the microwave for 75-90 seconds. If the cake is still wet, continue to microwave in 5-10 second intervals.

Allow cake to cool before serving.