In Mushroom Wars: that space series? cookies are a sign of being on the Dark Side
Toad likes cookies to the point that he occasionally turns into Sesame Street's Cookie Monster, as seen in the blooper Ssenmodnar 6.
Bullies love cookies to the point of running towards every cookie they see.
Daisy's favorite food is cookies, according to Mario 64: Love for Luigi. (Valentine's Special). When she sees Shy Guy selling them, she runs over to the shop, exclaiming that cookies are her favorite.
In Smg4 Joins the YTR, Mario wanted to join the YTR because they had cookies (also since he's lonely).
Bully Boss is the only Bully who doesn't like cookies.