In a microwave safe mug, stir together coconut oil, maple syrup, plant milk, and vanilla extract.
Add the flour, cocoa powder, baking powder, and salt and stir until incorporated. Stir in half the chocolate chips if desired.
Smooth out the top and sprinkle with the remaining chocolate chips, if desired. Microwave 50 seconds. Remove from the microwave and let rest 1 minute before enjoying.