Breakfast is challenging as none of the offerings will be a good value, although the food at Les Halles is very good. Any chance you can take a quick trip over to Riviera for the best QS breakfast on property?
For lunch, I would say the best bang for your buck is the Cantina in Mexico, the Regal Eagle in America, and Katsura Grill in Japan. The fish and chips stand is tasty, but not a great value, and the Lotus Blossom is Americanized Panda Express.