Preheat the oven to 350f (175C) and line a cupcake pan with cupcake liners.
In a bowl combine and mix room temperature milk, vinegar & yogurt. Let it sit for 5 min until it is slightly curdled.
Add sugar, oil & vanilla extract. Mix with a hand whisk until sugar granules are dissolved and oil is combined.
Combine and sift all the dry ingredients (flour, corn starch, baking powder, baking soda and salt) into liquid ingredients. Mix very gently with a hand whisk or electric whisk until the batter is smooth.
Fill the cupcake liners with the cupcake batter 3/4 way and bake for 13-15 minutes or until firm to touch. Cool them completely at room temperature.