That's the joke. The answer to "What's brown and sticky" is "a stick"; it's sort of an archetypal example of a bad pun (or a "dad' pun). The twist here is to take the other word in "brown and sticky" and make that the answer instead: a brownie.
And, yeah, hiding snarky or sassy stuff in 1 pt. font used to be a Compendium trope, way back when. =P