Homemade Ice cream cake is pretty easy to make. Take your favorite cake recipe(I used Sour Cream Yellow cake for this) and make a 6" or 9" round layer of it. You can use the leftover batter to make a few cupcakes, or make two layers and freeze one of them for later use. Line another round pan of the same size with plastic wrap. Take your favorite Ice cream flavor (Store-bought or homemade) and let it soften a bit. Then scoop it into the pan lined with plastic wrap, making sure to push the ice cream well into the corners. Put the pan into the freezer for a couple of hours to freeze again. Then unmold the ice cream, set it on top of the cooled cake layer, and re-cover the whole thing with plastic wrap. Let it sit in the freezer until you are ready to frost and decorate it. I used lightly sweetened homemade whipped cream to decorate this one, because the ice cream is so sweet that you don't need a heavy sweet frosting on top.