In a large mixing bowl, combine the flour, baking powder, salt, and granulated sugar.
Mix the potato milk, vegetable oil, apple cider vinegar, and vanilla extract in a separate container.
Combine the wet ingredients with the dry ingredients in your large bowl.
Mix until combined, but don't overwork the batter. Whisk until smooth but no longer.
Allow the batter to rest for five minutes.
Fry in a preheated, lightly oiled pan for three to four minutes a side or until golden brown and cooked through. Flip when you see bubbles forming in the up-side of your frying batter.