In a microwave-safe mug, combine flour, sugar, baking powder, and salt.
Mix the dry ingredients until well combined.
Add milk, vegetable oil, and vanilla extract to the dry mixture.
Stir until a smooth batter forms, ensuring no lumps remain.
Optional: fold in sprinkles for added fun.
Microwave the mug on high for 1 minute.
Check the cake; if it’s still wet in the center, microwave for an additional 10-15 seconds.
Let the mug cake cool for a minute before enjoying.
Top with whipped cream or additional sprinkles if desired.
Dig in with a spoon and savor the deliciousness!