Preheat the oven to 170 degrees Celsius.
Mix the soya milk and apple cider vinegar together and allow to sit for 5 minutes
Sieve the flour, cacao powder and baking soda into a large bowl.
Add the sugar and mix to combine.
Make sure the butter is soft and at room temperature. Add it to the dry ingredients and rub the vegan butter into the dry ingredients to form a crumb consistency.
Lastly add the soya milk mixture and the melted chocolate to the dry ingredients and whisk to ensure there are no visible lumps.
Cut 2 circles of parchment paper to fit the bottom of your 2 cake tins and place them into the base of the tins to prevent the cake from sticking. You can also rub some of the vegan butter along the sides of the tins to prevent the cakes from sticking to the sides and make removing them from the tins much easier!
Bake in the oven for 25-30 minutes. After 25 minutes, check they are done by sticking a clean knife into the centre of the cakes. If the knife comes out clean, the cakes are ready. If the knife has batter on the sides, allow them to bake further.
Once ready, remove the cakes from the oven and allow them to cool before removing from the tins. Once cooled, remove them from the tins and sit them on a cooling rack. Ensure that the cakes are completely cool before attempting to frost them.