Steps
1. In a microwave-safe mug, whisk together the flour, cocoa powder, baking powder, sugar, and salt.
2. Add the milk, vegetable oil, and vanilla extract, and mix until smooth.
3. Gently fold in the chocolate chips.
4. Microwave on high for 70-90 seconds, until the cake has risen but the center is still slightly gooey.
5. Let it cool for a minute before enjoying straight from the mug.