Root Beer with frosting

2 cups root beer 1 cup dark unsweetened cocoa powder 1/2 cup unsalted butter , cut into 1-inch pieces 1 1/4 cups granulated sugar 1/2 cup dark brown sugar ,[...]

3/4 cup butter 3 eggs 2 1/2 cups all-purpose flour 2 1/2 teaspoons baking powder 1/2 teaspoon salt 1 1/2 cups sugar 1 tablespoon root beer extract 1/2[...]

1 (18 ounce) box white cake mix (Betty Crocker Supermoist preferred) 1 (12 ounce) can root beer (1 1/2 cups) 1/4 cup vegetable oil 3 egg whites 1 teaspoon[...]

1 (18 ounce) package Betty Crocker super moist white cake mix 1 1/4 cups water 1/3 cup vegetable oil 3 egg whites 1/2 teaspoon ground allspice 1/2 teaspoon[...]

1 (18 ounce) package Betty Crocker super moist white cake mix 1 1/4 cups water 1/3 cup vegetable oil 3 egg whites 1/2 teaspoon ground allspice 1/2 teaspoon[...]

1 (18 ounce) box white cake mix (Betty Crocker Supermoist preferred) 1 (12 ounce) can root beer (1 1/2 cups) 1/4 cup vegetable oil 3 egg whites 1 teaspoon[...]