Mix all the dry ingredients - flour, sugar, cocoa powder, baking powder and chocolate chips - together in a small bowl.
Add in the vanilla and yoghurt and stir until completely combined.
Scoop into a small microwave-safe ramekin and cook in the microwave for around 50 seconds if you want a deliciously gooey centre or 60 seconds if you want a spongier brownie.
Dig in whilst still warm!