Spray a mug or a ramekin with nonstick cooking spray. Add sugar, flour, salt, baking powder, oil, milk, and vanilla and stir until combined. Sprinkle brown sugar and cinnamon on top.
Microwave for 45 seconds (my microwave is 1100 watts - if yours is less you may need to microwave it longer, do so in 15 second increments).
Enjoy warm!
