Preheat the oven to 180 Grad
Mix the soy milk with the apple cider vinegar and let it sit for 5 minutes.
Mix the softened butter with the applesauce and sugar.
Then add the flour, baking powder, and soy milk, and mix everything together until you have a smooth, lump-free batter.
Pour half of the batter into the greased pan and then proceed with the chocolate batter.
For the chocolate batter, add cocoa powder, sugar, and soy milk, then mix everything together.
Pour the chocolate batter over the light batter in the pan and use a fork to create a beautiful marble pattern by swirling the batters together.
Bake the cake for 40-50 minutes