UPDATE 2: I decided to install MacTeX-2015 and figured that would be a good opportunity to test out the solution above. I’m happy to report that it worked like a charm and it made for the easiest install of MinionPro I’ve had to date. Here is the updated, correct process:
If you don’t already have LCDF Typetools installed, you’ll need to do that. An easy way to do that is with homebrew: brew install lcdf-typetools.