Market Cafe Vdara is super convenient if you are staying at the Vdara hotel. It opens early and closes late. There is a side of it where you can purchase groceries with fresh fruit and juice and meats. But the other side is like a cafe/restaurant. I like their lunch menu, especially the burger and fries/onion rings. The strawberry smoothie was good out of all the other smoothies.
The breakfast baked goodies go quickly so make sure if you want some to grab it early. Unfortunately the chocolate croissants had very little chocolate in them. Their yogurt parfaits also were terrible. They were all fruit with no yogurt (even though it appeared to have a lot--I think they lined the outside with yogurt so it looked filled).
Other than these issues the food is good. Service can be fast or slow depending on the crowds. The prices are expensive, but what you are mostly paying for is the Vegas location and convenience.