Trying to remember a movie my babysitter showed me in the 80’s (?). In one of the final scenes, the kids are getting ready to break into a lab. They are supposed to be wearing disguises, and one of the kids puts on a superhero costume (his character reminds me of Chunk in The Goonies). They get past video cameras by putting a picture in front of it.
it’s worth trying the Disney special “Little Spies” from 1986.
http://www.imdb.com/title/tt0091420/
there’s also “The BRAT Patrol” which aired later that month.
http://www.imdb.com/title/tt0090680/
I don’t know if either quite fits, but they are Goonies-esque.