Ingredients for Cake layer

• 1 cup flour
• 2 teaspoons baking powder
• 6 tablespoons butter
• 2 ounces semisweet chocolate or 2 ounces chocolate chips
• ⅔ cup sugar
• 3 TBS cocoa powder Dutch-processed
• 1 TBS vanilla extract
• ¼ teaspoon salt
• ⅓ cup milk
• 1 egg yolk

Ingredients for liquid layer

• ⅓ cup cocoa powder Dutch-processed
• ⅓ cup sugar
• ⅓ cup brown sugar
• 1 ½ cups water hot