Hmm, this is looking familiar… Just go to this thread, What’s on the menu? Food riffs - MST3K Central - Mystery Science Discourse 3000
and eat whatever you find there.
Not themed, but in the old days I’d get home for the show after work, with a mighty appetite, and would cook up fun foods, like pizza, tacos, hamburgers.
To snack on, junior mints or starburst for sweets, for something healthier, grapes, and baby carrot sticks with dip.
As for an MST3k food tie-in? For Nu-MST and the opening of the Gizmoplex, gotta have some pizza rolls.