Barb's Country Junction gets a 5 star rating for me because it is truly everything that a Pittsburgh restaurant should be. In addition to being the apple of my nostalgia's eye, it is also the constant thought of my tummy when I'm hungry on the weekends.
Barb's breakfasts cannot be beat, but truly any meal you get there you won't regret. Everything is made to order, with fair portions, and great prices. My recommendation is a breakfast sandwich on a bagel and a coffee. There's nothing better than drinking from a cup that could have come from your grandma's kitchen.
I know that Gab N Eat is nearby, and Barb's can be a little weird get to with the strange traffic pattern but this really is a gem of Carnegie that you've gotta try!