Steps
1. In a microwave-safe mug, whisk together the flour, sugar, cocoa powder, baking powder, and salt.
2. Add the milk, vegetable oil, and vanilla extract to the dry ingredients. Mix until smooth and well combined.
3. Microwave on high for 70-90 seconds, or until the cake has risen and is set but still moist.
4. Let it cool for a minute before eating directly from the mug. Optional: top with whipped cream or chocolate chips.