This is an excellent diner in Canonsburg! We went here on a Sunday afternoon and has a delicious breakfast!
When you walk in you're in a small, unfancy dinning room where you can also see the kitchen. The decor is a bit dated but honestly their food is so good that it hardly matters. There is not a bunch of seating, so I imagine that there's a bit of a wait earlier on in the day.
We ordered standard breakfast foods (omelet, scrambled eggs, pancakes and hash browns). Admittedly the pancakes are just ok, but the hash browns are homemade and some of the best I've ever had. We will definitely be back!!