In a 250 ml (1 cup)-capacity coffee cup, combine the flour, sugar, cocoa powder, and baking powder.
Add the milk, oil, and vanilla.
Gently stir with a fork until the batter no longer has lumps.
Sprinkle with the chocolate chips.
Cook the cake in the microwave for 45 seconds.
Let cool for 5 minutes to allow for the cake to finish cooking.
