Vegan Chocolate Fairy Cakes

• 140 ml soy milk (1/2 cup + 1 tablespoon)
• ½ Teaspoon apple cider vinegar (sub for white vinegar)
• 100 g self-raising flour (¾ cup)
• ¼ Teaspoon baking soda
• 2 Tablespoons unsweetened cocoa powder
• 100 g caster sugar (½ cup)
• 1 Teaspoon vanilla extract
• 3 Tablespoons vegetable oil

For the icing:

• 130 g icing sugar (1 cup)
• 1 Tablespoon cocoa powder
• 2 Tablespoons cold water

To top:

• Vegan chocolate sprinkles of choice