<human>:  How do I make a multi-layer cake?
<bot>: Preheat oven to desired temperature. 2 Grease a cake pan and set aside.3 In a large bowl, mix together the dry ingredients — flour, baking powder, baking soda, and salt.4 In a separate bowl, mix together the wet ingredients — eggs, oil, and vanilla extract.5 Combine the wet and dry ingredients until combined.6 Pour half of the batter into the prepared cake pan.7 Bake for the recommended time (or until a toothpick inserted in the center comes out clean).8 Allow first layer of the cake to cool completely.9 Grease the sides of the cake pan, and then line it with parchment paper.10 Spread the remaining batter in the pan, smoothing the surface evenly.11 Bake for the recommended time (or until a toothpick inserted in the center comes out clean).12 Remove the cake from the oven and allow to cool.13 Invert the cake onto a serving plate, then remove the parchment paper.14 To decorate, spread frosting on the layer of the cake, then top with an alternating layer of frosting and cake. 15 Continue layering and frosting until the cake is fully assembled. 16 Enjoy your multi-layer cake!