<human>:  How do I bake a chocolate cake?
<bot>: Firstly, preheat the oven to 350F. Next, prepare the ingredients. These are 2 cups of plain flour, 3/4 cup cocoa powder, 1/2 teaspoon baking soda, 1/2 teaspoon baking powder, 1/2 teaspoon salt, 2/3 cup vegetable oil, 1 cup sugar, 2 eggs, and 1 cup of milk. After that, mix the dry ingredients, which is the flour, cocoa powder, baking soda, baking powder, and salt. In a separate bowl, add the vegetable oil and sugar, and whisk until blended. Then, add in the eggs, one at a time. Finally, add the dry ingredients and milk alternately to the bowl, beating each time until blended. Once done, pour the cake batter into a 9-inch cake pan, greased lightly with butter. Place it in the oven and bake for about 25-30 minutes. Test by inserting a toothpick into the centre of the cake; if it comes out clean, the cake is ready. Allow to cool before serving with chocolate icing. Enjoy!