Like grandma made! :) Bake a yellow or white cake . Any mix will do. Then poke some holes in it. Next, make some Jello (any flavor you like) per the instructions on the box. Pour the Jello on top of the cake, making sure to cover evenly. Once covered, pop it into the fridge for an hour or two. The longer, the better. Poke cake is always better chilly. Right before serving, spread Cool Whip on top.