How To Make Vegan Oreo Cake From Scratch. Ingredients: - 1.5 cups self raising flour - 3.5 tablespoons of corn starch - 1/2 cup sugar - 1.5 teaspoon baking powder - 1 teaspoon baking soda - Pinch of Salt - 105ml Oil (*80ml sunflower and 25 coconut oil) - 200 ml vegan non