I am a big fan of Kelly O's in the North Hills and in the Strip. As far as diners go, they have great breakfasts. I usually tend to get the Mixed Grill for breakfast, most often with the addition of ham (you can add a choice of meat to the mixed grill for an upcharge). I usually don't get cheese on top, but this past Saturday, January 18, I did. My only complaint was that all the cheese wasn't melted. Still, the Mixed Grill was satisfying and generally done very well.
My frequent breakfasting partner got his usual, the Outrageous Breakfast sandwich. This sandwich is very large, and comes on (the best!) Mancini toast. He always raves about it, and this is someone who is a bit of a foodie.
Overall a great breakfast experience!