1977 - SEA-PDX-BUR on a Continental 727-200. Between PDX-BUR they served scrambled eggs, sausage, and hashbrowns. We were in K class, which did not get meals, but it sure looked good!
(Don't cry for us though, CO flew all five of us LAX-SEA in UA First and gave us $400 for offering up our five K class seats BUR-SEA. Had an awesome filet on that one).
AS and UA both used to serve a full hot breakfast (omelette, meats, hashbrowns) as recently as the late-1990s up and down the coast. I always loved AS' hot pastrami on rye sandwiches, too.