Not since the price went up but yes, I have had breakfast there solo in the past. I feel I got the same amount of attention from the Princesses that every other party did - yeah, it was fun!
I've done CRT for b'fast with the price change on the spure of the moment whim since I was in shock there was an opening two days before! The food was great, characters were fun plus I got a photo package to show my family!