Steps
1. Preheat a microwave-safe mug or small bowl.
2. In the mug, mix flour, sugar, baking powder, and cocoa powder until combined.
3. Add milk, vegetable oil, and vanilla extract; stir until smooth.
4. Fold in the rainbow sprinkles gently.
5. Microwave on high for 60-75 seconds until the cake has risen and is cooked through.
6. Let cool for 2 minutes.
7. Top with whipped cream and place a maraschino cherry on top.
8. For extra whimsy, add a few more sprinkles over the whipped cream.
9. Serve immediately and enjoy the playful, sweet celebration treat!