Challah bread in OC?
Jerry's Deli sells pretty good Challah. There's one right by South Coast Plaza. I make a better one with a really easy recipe from my bread machine's cookbook. If you have a bread machine it's very simple. It's better if I just have the machine kneed the dough and then I braid it and bake it in the oven, but even just in the machine it's very good.
They also have good bread, including Challah, at French's Pastry (www.frenchspastry.com) at the corner of Baker and Fairview in Costa Mesa.
There's a bakery called Poul's in Orange, and their challah is excellent. ( 770 N Tustin St, Orange, 92867 - (714) 532-5101) I went in on a Friday, without pre-ordering, and they had a lot of them left.
Also, Benjie's deli in Santa Ana has challah. I think you need to order ahead, though.