Preheat oven to 400°F/200°C. Lightly grease an 8×8 square baking pan with oil or spray with baking spray. Set aside.
Mix the vegan milk and apple cider vinegar together. Let sit for at least 3 minutes to create a vegan buttermilk mix. In a large bowl, mix all the dry ingredients together. Set aside.
In the same container as the milk mixture (just to avoid using extra containers), mix all the wet ingredients together slowly to incorporate, then a bit quicker to mix together properly. Pour the wet ingredients into the dry and mix until fully combined & smooth. The batter should be thick but pourable.
Pour the batter into the pan, and using a spatula, smooth down the top into an even layer.
Bake for 23-25 minutes, until a toothpick comes out clean. Move the pan to a wire rack and allow to cool for at least 10 minutes, preferably until cool. Slice into 9 or 12 slices, serve with vegan butter or maple syrup (or both) and enjoy!