In your microwave-safe mug, add the all-purpose flour, granulated sugar, unsweetened cocoa powder, baking powder, and a dash of salt. Mix these dry ingredients together until well combined.
Pour in the milk, canola oil (or melted butter), and vanilla extract. Mix until you have a smooth batter.
Fold in the chocolate chips to the batter.
Place the mug in the microwave and cook on high for 1 minute. Adjust time based on your microwave's wattage.
Carefully remove the mug from the microwave and let the cake cool for a minute before enjoying.