Per serving:
Preheat oven to 350 F and lightly oil 9 x 9 x 2 inch baking pan (or 12 inch cast iron skillet).
Whisk apple cider vinegar and nondairy milk together in small mixing bowl until mixture is frothy.
Combine cornmeal, flour, baking soda and salt together in large mixing bowl. Add oil to nondairy milk mixture, then pour wet ingredients into dry ingredients. Mix until batter is just evenly combined (a few clumps are okay). Pour batter into baking dish and transfer to oven.
Bake cornbread for 35 minutes, or until top is firm and edges are gently golden. Allow bread to cool before cutting into squares and serving.