Unbelievable Chocolate Cake | Food Stuff

Ingredients

• 2 ½ cups all purpose flour
• 1 ¼ teaspoons baking powder
• 2 ½ teaspoons baking soda
• 1 ¼ cups buttermilk
• 2 large eggs plus 1 large egg yolk
• 1 ¼ teaspoons salt
• 2 ½ cups sugar
• 1 ¼ cups unsweetened cocoa powder
• 1 ½ teaspoons pure vanilla extract
• ½ cup plus 2 tablespoons vegetable oil
• 1 ¼ cups warm water