We had a good experience at Black Bear Diner in Santa Clarita. It's a chain breakfast place where you can get lots of basic breakfast items in a bear-themed environment (without all the growling and mothers protecting their young which you get when real bears are around.)
The portions were huge so you definitely won't go hungry here and there are a million things to choose from, as well as plenty to eat for vegetarians, and gluten-free folks will do okay too. (Though the only gluten-free bread option is a hamburger bun.)
I had the "No Meat, Just the Eggs Please" which was a good amount of egg whites and an insane amount of crispy hashbrowns. They were cooked perfectly but lacked seasoning so were a bit bland. They were nice enough to sub a single "Sweet Cream Pancake" as my bread option. This was a generous-sized thing on its own and tasted as good as a pancake should.
The coffee was really good. Too often conventional breakfast places serve up weak coffee which just doesn't do the job. The mug they served me was filled with a bold, strong coffee that I would drink over and over. Well done!
Our kid enjoyed his breakfast burrito without meat...another giant portion which even he, with all his teenage eating prowess, could not finish.
And my wife was fine with her benedict meal served without bread (no gluten-free breakfast bread option.)
They did forget to bring our english muffin side until the end of the meal. We ended up packing it up and taking it with us with the rest of the leftovers.
It was a great surprise to have decent food, large portions, and really good coffee at a chain conventional breakfast spot. I'm a fan and will be back.