Preheat Oven: Preheat oven to 350°F (175°C). Grease muffin pans or line with paper baking cups.
Prepare Almond Milk Mixture: Mix 1 tablespoon apple cider vinegar with 1 ½ cups almond milk. Let stand for 5 minutes to curdle.
Mix Dry Ingredients: Whisk together 2 cups flour, 1 cup sugar, 2 teaspoons baking powder, ½ teaspoon baking soda, and ½ teaspoon salt in a large bowl.
Mix Wet Ingredients: In a separate bowl, combine the curdled almond milk mixture, ½ cup liquid coconut oil, and 1 ¼ teaspoons vanilla extract.
Combine Mixtures: Pour wet ingredients into dry ingredients. Stir just until blended. Do not overmix.
Fill Muffin Cups: Spoon the batter evenly into the prepared muffin cups, filling each about 2/3 full.
Bake: Bake for 15-20 minutes until the tops spring back when lightly pressed.
Cool and Frost: Cool the cupcakes in the pan on a wire rack. Once cooled, frost with desired frosting.