Human: What is the easiest way to make a one-layer cake? Assistant: 
The easiest way to make a one-layer cake is to mix together the cake ingredients, spread the batter evenly in a greased and floured baking pan, and bake according to the instructions on the recipe. Once the cake is done baking, let it cool in the pan before transferring it to a plate or serving platter. To finish it off, frost or glaze the cake, if desired.