Pre heat the oven to 180 C / 350 F. Grease a 9 x 5 inch loaf pan.
Mix the apple cider vinegar into the soy milk in a small bowl, and set aside.
In a small bowl, whisk together the vegan butter and brown sugar.
In a large mixing bowl, add the flour and baking powder. Mix together.
Combine the dry ingredients with the butter mixture and soy milk mixture. Fold together until you get a smooth batter.
Pour batter into loaf pan. Place into oven and bake for about 60 minutes. It’s ready when a toothpick inserted into the center of the cake comes out clean.
Let pound cake cool down before removing from the loaf pan. Sprinkle powdered sugar over the cake before serving.