Westin Phoenix Downtown. The lounge is open every day from 6 am to 10 pm. They have a pretty good selection for breakfast - eggs, bacon, sausage, fried potatoes, bagels, cereal, etc. with several juices, water, coffee, soda, tea, etc. Supposedly they serve appetizers from 5 pm to 7 pm, and then dessert bites later in the evening, but I didn't check.
You can also elect to take your welcome amenity in the form of breakfast coupons for the hotel restaurant, but it seems like a waste given that the lounge's options were pretty good.