Preheat oven to 350 degrees. Lightly spray a 9 inch cake pan with oil, using as little as possible. You can also cut a circle of parchment paper to fit the bottom of the pan. This will make it easier to pop the cake out when it's done.
Add all dry ingredients, including chocolate chips, in a large bowl and stir to combine.
In a blender, add the cooked and cooled sweet potato, almond milk, apple cider vinegar and pure vanilla extract. Blend until very smooth.
Add the blended mixture to the dry ingredients, and also dump in the non-dairy yogurt. Stir with a wooden spoon until just combined, being careful not to over mix.
Add the cake batter to the pan, spreading it evenly with a spatula.
Bake for 25-30 minutes, until a toothpick comes out clean.
Let cool completely before frosting (recipe below.)