What to do in a positionally won situation? In the below position, White is winning because Black cannot do anything. Black's b-pawn is the last fence barring White from checkmating the king rather easily.

k1r4r/1p1nppbp/2b3p1/N7/4PP2/3PB2P/P3B1P1/1RR3K1 w - - 0 1


There are no immediate tactics available for white, but it is clear that white's rook should double up as that is the only thing left to do.

Should the game be played on winning the b-pawn, or is there an easier way to win that I am missing? It is currently White to play. The engine Stockfish 6 doesn't show any captures on b7 happening within the next ten moves, but all play does seem to occur on the queenside.

What are some good plans for White?
I don't think that White should expect to increase his (already large) advantage very quickly. You say there are no immediate tactics, and I don't see any either. But simple moves here are very strong.


1. Nxc6 gets the two Bishops in a position where they will dominate. 1..Rxc6 is forced because if ..1..bxc6 then Rc4. 2. Rxc6 bxc6 and now 3.e5 leaves Black just a pawn down with an awful position. Progress has definitely been made. All of Black's pieces are stuck doing even less than they were. 

Over the next twenty or thirty moves you will keep Black tied down, bring your King to the queenside, and promote that rook pawn, so be happy.