Mini Cupcakes

Ingredients : ½ cup milk 1 tablespoon white vinegar ½ cup unsalted butter at room temperature 10 tablespoons white sugar 2 teaspoons vanilla sugar 2 large eggs ¾ cup all-purpose flour 1 tablespoon all-purpose flour ½ cup unsweetened cocoa powder ½ teaspoon baking powder ¼ teaspoon baking soda 1 pinch...