Preheat your oven to 350F and place cupcake liners into a muffin pan. Set aside for later.
First add the plant-based milk and apple cider vinegar to a large mixing bowl. Whisk together and let sit until the milk curdles, about 2-3 minutes, to create a vegan buttermilk.
Add the remaining wet ingredients to the bowl including the sugar, olive oil, and vanilla and whisk together.
Next, add the dry ingredients to the bowl including the pastry flour, baking powder, baking soda, and salt. Add the pastry flour first and then pile the remaining ingredients on top. Whisk together until a smooth batter forms.
Add the batter to the 9-10 cupcake liners so that each is about ¾ full. Bake the cupcakes for 20-23 muffins until cooked through. Remove from the oven and let cool before frosting.