The Henry inside the Cosmopolitan is a 24/7 diner with lounge and table seating. Great for late night snacks but nothing extraordinary for sure. If you're hanging out at Vesper or any of the Cosmo bars around, The Henry is probably your best choice to grab a bite.
The menu has everything from burgers, chicken wings, salads... you name it. Average pricing (burger $12) but kinda slow service.
Our table got the FRENCH ONION SOUP ($12) and the CHICKEN FINGERS W/ FRIES ($15) which tasted as expected. The soup was a good value though.
Would come back if everything else fails.