Chocolate Brownie Cake

Name: Chocolate Brownie Cake
Cuisine: American
Ingredients: 1 cup Coca-Cola; 1/2 cup oil; 1 stick of butter; 3 tablespoons cocoa; 2 cups of sugar; 2 cups flour; 1/2 tsp salt; 2 eggs; 1/2 c milk; 1 tsp baking soda; 1 teaspoon vanilla; 1 stick butter; 3 tsp cocoa; °6 tsp cream or milk; 1 tsp vanilla; 3 3/4 cups confectioners’ sugar