Preheat the oven to 425°F (220°C). Line the muffin pan with cupcake liners and lightly grease them with non-stick oil spray. Set aside.
Combine the 2½ cups (300g) all-purpose flour, 2 teaspoon baking powder, ½ teaspoon salt, and 1 teaspoon ground cinnamon in a medium mixing bowl. Whisk well and set aside.
In a large mixing bowl, whisk together ½ cup (113g) vegan butter, melted, ¾ cup (150g) dark brown sugar, and 2 teaspoon vanilla. Mix until combined.
Add 1 cup (240ml) dairy-free milk and 2 teaspoon apple cider vinegar, and whisk until well combined.
Now, add the dry ingredients to the wet and stir until just combined—do not overmix. Then, gently fold in the 2 cups (200g) peeled and chopped apples.
Use the ice cream scoop or a spoon to divide the batter evenly between the muffin tins.
Fill each muffin tin up to the top.
Optional: Sprinkle cinnamon sugar on top if preferred.
Bake the muffins for 5 minutes at 425°F (220°C), then reduce the temperature to 350°F (180°C) while they are still in the oven.
Continue baking for another 14-16 minutes or until the cake tester inserted in the center comes out clean.
Remove the muffins from the oven and let them cool in the pan for 5 minutes. Then, transfer them onto a cooling rack and let them cool completely.
Enjoy the moist vegan apple muffins warm or at room temperature.