Cut sweet potato into cubes and boil / steam until soft.
Mash with a fork or immersion blender.
Add in all of the ingredients and stir.
Fold in chocolate chips last.
Bake in a 9 inch square baking pan at 350f for 25-28 mins.
Test with a toothpick, you still want them fudgey (not a clean toothpick) but not too much batter sticking.
Let cool completely before cutting.
