Preheat oven to 160°C. Line muffin pans with cupcake liners. In a bowl mix flour, sugar, baking soda, cornstarch and salt. Put the vinegar into the soymilk and let it thicken for 10 minutes.
In the bowl of a mixer mix vinegar-soymilk, oil and vanilla. Carefully add the flour mixture. And beat on medium speed until incorporated. Don´t overbeat it!
Fill cupcake liners about 3/4 full and bake in preheated oven for about 15 minutes at 180°.
