Minnie is at both Cape May & Chef Mickeys....and I have to say, Cape May is sooooooo much better than Chef Mickeys. The food is 100% better (both quality & variety). The atmosphere is much prettier and more relaxed. Chef Mickeys is chaotic and the atmosphere is blah. Not the cleanest place either, IMHO.
As PPs have pointed out Minnie can be found at both Chef Mickey's and Cape May. I will mention that we did both breakfasts during out trip in September. We found Chef Mickey's to be clean and the food to be fresh and good. The atmosphere can be chaotic since there is a "party" every 15 minutes, but it is a lot of fun for the kids.
Cape May was wonderful. The buffet was truly a highlight of our trip. The food was very, very good and the characters were so much fun. Definitely not the party experience, but just as fun. It was a great way to start our morning before heading into Epcot.