Wow, just wow. I can't remember the last time I laughed that hard. I think they went beyond disregarding consistency when patching Chef's dialogue together and intentionally tried to make it as glaring as possible, and it worked to great comedic effect. After the welcome back scene and his "You bet, goodbye, CHILDREN!!" line, I cracked up so bad I had to pause the playback. And it just kept getting crazier.
I just wonder now, will Mr. Derp take over lunchroom duty again, or will we be seeing more of Darth Chef? "He's more microwave now than man, brainwashed and insane."