In a small bowl combine the maple syrup, greek yogurt, oil and vanilla extract. Use a rubber spatula to throughly mix.
Add the cocoa powder, salt and baking powder and mix well.
Add the flour and mix just until there are not traces of flour left.
Line a mug with a muffin paper (to help with clean up) and fill with the batter. Add a couple chocolate chips on top or drop a spoon of nut butter in the center if desired.
Microwave for 1 minute. Ready!