Steps
In a microwave-safe mug, combine flour, sugar, cocoa powder, baking powder, and salt.
Add the milk, vegetable oil, and vanilla extract to the dry ingredients and mix until smooth.
Stir in chocolate chips if desired.
Microwave on high for 1 minute and 30 seconds, or until the cake has risen and is set in the middle.
Let it cool for a minute before enjoying your delicious mug cake.