Preheat the oven to 425 ºF.
Combine the 1 cup plant milk and 1 tbsp apple cider vinegar to make a buttermilk.
Combine the 2 1/4 cup all-purpose flour, 2 tbsp baking powder, 2 tsp granulated sugar, and 1 tsp salt in a large bowl.
Combine the buttermilk mixture and 1/2 cup neutral oil.
Pour the liquid ingredients into the dry ingredients and combine. The dough should be tacky yet workable. Use extra flour if it's too tacky.
Smoosh the dough out on a table until it's about 1" thick. You can use a rolling pin if you'd like.
Use a 2" round cookie cutter (or narrow mouthed glass) to cut the biscuits. Alternatively, just cut into squares. If you do circles, after doing your first pass, combine the scraps and re-roll to get extras.
Place on a lined baking sheet so they're just touching each other.
Use your finger to make a little dimple in the middle so that they'll be flat after they rise.
Backe for 15-20 minutes.