Place the dry ingredients in a microwave safe mug or small bowl and mix together.
Add in the wet ingredients up through the vanilla and mix again.
Drop the peanut butter on top and gently press it in a bit, then sprinkle the chocolate chips over top.
Microwave on high for about 1 minute (add an additional 20 seconds if your microwave isn't very powerful). Let cool for a minute or two, then enjoy!
*Optional: skip the cooling phase and just drop a scoop of ice cream on top.