Triple-Chocolate Mousse Cake... Triple-Chocolate Mousse Cake   Ingredients Vegetable-oil cooking spray 2/3 cup all-purpose flour 1/3 cup unsweetened Dutch-process cocoa powder 2/3 cup sugar 1/2 teaspoon baking soda 3/4 teaspoon baking powder 1/4 teaspoon salt 1 large egg, room temperature 1/4 cup whole milk 3 tablespoons vegetable oil 1/2 teaspoon pure vanilla extract Individual Chocolate