In a large mixing bowl, combine the flour, baking soda and salt. Stir well to combine.
In a small mixing bowl, mash together the potato, oil and milk.
Pour the potato mixture into the flour, and knead with your hands until you have a nice, soft dough.
Note that you definitely want to dust your work surface and rolling pin with flour. The dough will stick like crazy if you don't. A little flour makes all the difference.
Roll out the dough to about a 1/4 inch thickness.
Use whatever cutter you have on hand (I used a cup because I don't have a biscuit cutter <gasp!>.
Place the biscuits on a parchment-lined cookie sheet and bake for about 12-14 minutes or until fully cooked through.
Notes
Please note that the nutrition data given here is a ballpark figure. Exact data is not possible.