• Preheat the oven to 180 C. Grease the cavities of a donut pan well.
• Combine the milk and vinegar in a small bowl. Set aside for 5 minutes.
• Place the grated apple in a kitchen towel and squeeze out the juice. You can drink this juice!
• In a large bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon powder, and sugar,
• Add in the milk-vinegar mixture, coconut oil, vanilla extract, and the grated apple.
• Mix well until a smooth batter, of soft-dropping consistency is formed.
• Spoon or pipe the batter into the prepared pan, filling 3/4 of the way.
• Bake at 180 C for 10-12 minutes or until a skewer inserted in the center comes out clean. 
• Let the donuts rest for 5 minutes in the pan before turning them out on a cooling rack.

Cinnamon Sugar Topping

• Combine the sugar and cinnamon powder in a wide bowl.
• Brush each donut with the melted butter and then toss in this cinnamon sugar mixture.
• Serve and enjoy!