<human>: I'd like to find out how to make a delicious cake with a chocolate icing.
<bot>: To make a delicious cake with a chocolate icing, start by preheating the oven to 350 degrees Fahrenheit (177 degrees Celsius). Then mix together 1 cup of all-purpose flour, ½ teaspoon baking soda, and ¼ teaspoon salt in a bowl. Next, add ¾ cup vegetable oil, 2 eggs, 1 cup of sugar, and 1 teaspoon vanilla extract to the bowl and mix until everything is well combined. Finally, stir in ½ cup of cocoa powder and ½ cup of buttermilk. Grease a 9x13 inch pan with butter or cooking spray, then pour the batter into the pan. Bake for 30 minutes, or until a toothpick inserted into the center comes out clean. Let cool before adding your desired icing. Enjoy!