When my family insisted on adding the Hoover Dam to our Vegas trip, I immediately got to researching where to eat on the way (of course). There really was only one place to go... The Coffee Cup. It is Triple D famous. And I've been to a lot of Guy's places that haven't been that great, but this one is worth the stop for sure.
Yes, you will probably wait. I strongly recommend going early. But we were there shortly after opening and still a few minutes wait. Go early! By the time we left (on a weekday around 9 am), there was a long line. But it's a friendly line and the town of Boulder City is a charming place to be.
We ordered French Toast (comes in 1/2 or full order) and omelets (a couple of DIY versions and the Cali Omelet). Everything was delivered quickly by our super efficient server. The food was terrific - way above your standard breakfast joint. Coffee was never more than half full. And though the place is busy, it didn't feel like it - you could carry on a normal conversation, didn't feel uncomfortably squeezed in between too many people and we didn't feel at all rushed.
You should absolutely bookmark this for your any off the Strip journey. Great food and just the right amount of kitsch and sass.