To begin, preheat your oven to 350 degrees F (175 degrees C) and prepare a 9x13 inch baking pan with cooking spray.
In a mixing bowl, whisk together the whole wheat flour, soy flour, cinnamon, ground cloves, baking soda, tapioca starch, and salt until blended. This will ensure your cake is light and airy, with a perfect crumb.
Bake in the preheated oven until a toothpick inserted into the center comes out clean, about 30 minutes. Cool in the pan for 10 minutes before removing to cool completely on a wire rack.