Human: I'd like to find out how to make a delicious cake with a chocolate icing. Assistant: 
You can start by gathering the ingredients you need for the cake, such as flour, baking soda, cocoa powder, sugar, butter, eggs, and milk. Preheat your oven to 350 degrees Fahrenheit (177 degrees Celsius). Grease and flour a 9x13 inch pan. In a large bowl, mix together the dry ingredients – the flour, cocoa powder, baking soda, and sugar. In a separate bowl, cream together the butter and sugar until light and fluffy. Beat in the eggs one at a time. Add the dry ingredients to the wet mixture and stir until combined. Finally, add the milk and stir until everything is fully incorporated. Pour the batter into the prepared pan and bake for 25-30 minutes or until a toothpick inserted in the center comes out clean. Let cool completely before frosting. To make the icing, melt the chocolate and butter in a double boiler. Remove from heat and let cool slightly. Then, whisk in confectioners’ sugar until it forms a thick paste. Spread over the cooled cake and enjoy!