Decadent Chocolate Cupcakes with Creamy Vanilla Frosting

Ingredients

• 1/2 cup plant milk
• 1/2 tablespoon white vinegar
• 3/4 cup plus 2 tablespoons multipurpose gluten-free flour
• 3/4 cup plus 2 tablespoons granulated sugar
• 1/4 cup plus 2 tablespoons cocoa powder
• 3/4 teaspoon baking soda
• 1/4 teaspoon plus 1/8 teaspoon baking powder
• 1/4 teaspoon plus 1/8 teaspoon kosher salt
• 2 rounded tablespoons cornflour mixed with 3 tablespoons water
• 1/2 cup warm water (microwaved for about 30 seconds)
• 2 tablespoons vegetable oil
• 1/2 teaspoon pure vanilla extract
• 4 1/2 cups icing sugar
• 2 teaspoons pure vanilla extract
• 1/4 cup water (room temperature, you may not use it all)