How do I ACTUALLY control my dreams?

I've already gotten to the point where I can induce a dream. And most of the time I remember them quite well. What I want to know is how do I trigger the control? Is there some way to realize I'm dreaming aside from putting my hand on a wall or rubbing my hands? I'm so close yet so far from my goal. And when I do realize I'm dreaming, how do I control it? Do I just say "let there be chips" and a bag of chips appears? People need to study this more.