- Preheat the oven to 350°F or 180°C. Grease and flour (or line) a 8" (20 cm) cake pan, and set aside. 
- In a glass, mix the cornstarch and 2 tbsp water and set aside. 
- In a bowl, mix your dry ingredients together (flour, sugar, vanilla sugar, baking soda, baking powder and salt), and set aside. 
- In another bowl, mix the oil, non-dairy milk and cornstarch mixture together until combined. 
- Add the wet ingredient mixture to the dry ingredient mixture, and mix everything until incorporated. 
- Place the batter in the cake pan. 
- Bake for 15-20 minutes, or until you insert a toothpick and it comes out clean or with a few crumbs. 
- Allow to cool completely (about 1-2 hours).