You just have to get a good recipe, memorize it, then do it over and over and over again till you have it down pat.

Whereas with say, cooking meat, you can have an idea in your head, start working and change things constantly as you go along until you get something that tastes good. And if towards the end it isn't that good, you just add a little salt. You can't just add powdered sugar to a cake and no that it will make it all right.