Preheat oven to 350°F (175°C) and line a 12-cup muffin tin with cupcake liners.
In a bowl, combine almond milk and apple cider vinegar. Let sit for 5 minutes to create a dairy-free buttermilk substitute.
In a separate bowl, whisk together flour, sugars, baking soda, baking powder, and salt.
Add oil, vanilla extract, and the milk mixture to the dry ingredients. Stir gently until smooth and lump-free.
Divide batter evenly into liners, filling each about ¾ full.
Bake for 18–22 minutes or until a toothpick inserted in the center comes out clean.
Cool completely before frosting.