Decadent Chocolate Cake

Ingredients

• for cake
• 1 cup boiling water
• 3 ounces unsweetened chocolate
• 8 tablespoons sweet butter (1 stick)
• 1 teaspoon vanilla
• 2 cups sugar
• 2 eggs, separated
• 1 teaspoon baking soda
• 1/2 cup sour cream
• 2 cups flour, less 2 tbsp
• 1 teaspoon baking powder
• for frosting
• 2 tablespoons sweet butter
• 3/4 cup semi-sweet chocolate chips
• 6 tablespoons heavy cream
• 1 1/4 cups confectioners' sugar
• 1 teaspoon vanilla