We went to Chef Mickey's for our DD's first birthday last year and it was a blast! The character interaction is great and the food was decent. It is pretty standard buffet fare...pastas, chicken, some seafood, etc...
I had not been to this buffet before, so I wasn't aware of the lg. dessert selection they had. I ordered our DD a special Minnie birthday cake, but think that they can bring a cupcake from the buffet to your table w/ a candle. Call ahead and make a request for this.