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Add the butter to your mug and microwave until melted (about 30 seconds).
Whisk in the milk, vanilla extract, egg yolk & sugar with a fork.
Then whisk in the flour and baking powder. Stir in the sprinkles.
Microwave for 60-90 seconds on medium power. The top should look set when it's done.
Cool for at least 1 minute before enjoying.
Beat the butter using an electric mixer or whisk with a fork until smooth.
Beat/whisk in the powdered sugar 1 tablespoon at a time until the desired sweetness is reached. Then beat/whisk in the milk.
Spread/pipe on top of the cake.