Either the beginners program in Starting Strength or the mass gain template that is sticky noted on the top of the mass gain forum and in Performance Menu number 17.
I am currently doing the mass gain program and enjoying it. There are a couple of guys on this board that are doing the starting strength program. I think if you look under the training logs section you should be able to see some.
Both are simple, time efficient and effective. Good luck.
What we think, or what we know, or what we believe, is in the end, of little consequence. The only thing of consequence is what we do. -John Ruskin