Flour mixture: In a large bowl, whisk together flour, unsweetened cocoa powder, white granulated sugar, baking powder, baking soda (bicarbonate of soda) and salt.
1 ⅓ cup (166 g) all purpose flour, ¼ cup (25 g) unsweetened cocoa powder, ¾ cup (150 g) white granulated sugar, 1 teaspoon baking powder, ½ teaspoon baking soda, ¼ teaspoon salt
Milk mixture: In a separate small bowl, whisk together milk, vinegar, vanilla extract and vegetable oil.
½ cup (120 ml) whole milk, 2 teaspoons (10 ml) vinegar or lemon juice, 1 teaspoon (5 ml) vanilla extract, ⅓ cup (72 ml) vegetable or canola oil
Pour the milk mixture into the flour mixture, followed by the Coca Cola.
1 cup (250 ml) Coca-Cola
Whisk to form a smooth batter.
Pour the batter into the lined baking pan. Bake for 20 - 25 minutes or until a skewer inserted in the middle of the cake comes out clean.
Once the cake is finished baking, place the baking pan on a wire rack to cool for about 10 minutes. It's not necessary to remove the cake from the pan.