To create your vegan ‘buttermilk’, mix the soy milk and apple cider vinegar together. Set the buttermilk aside for 8 minutes so that it can curdle. Measure out the other ingredients for the recipe in the meantime.
Combine the flour, light brown sugar, cinnamon, allspice, nutmeg, baking powder, baking soda and salt in a large mixing bowl.
Pour in the curdled soy milk, canola oil, vanilla extract and maple syrup. Fold the dry ingredients into the wet ingredients until the pockets of flour are gone.
Pour your cake batter equally into the two prepared cake tins and sprinkle the streusel on top of each of them. Bake them in the centre of the oven for 20 minutes. By this point, a skewer will come out of the cakes nice and clean.
Let the cakes cool in their tins for 15 minutes, then place them on a cooling rack to cool completely.