Della's is a great choice if you're staying in Luxor or Mandalay Bay.
It's one of the only healthier options I found for a fair price. I got the lemon poppy see side pancake -- which is one huge pancake for $4! Their omelets was really fresh and good as well, I opted for gruyere + spinach + mushrooms, the mushrooms were the best part.
Considering the price -- I actually thought the portions would be smaller, but the portions were more than enough, and everything tasted really fresh and healthy.
I definitely recommend this spot as a good breakfast/ lunch spot!