Cookies are a food in SuperMarioGlitchy4's videos.
In Mushroom wars: that space series? cookies are a sign of being on the Dark Side.
In Mushroom wars: that space series? part 3 THE DOWN OF THE WEEGEESTAR, we see possible evidence that Old Man Hobo likes cookies. When Mario and his friends are returning to their planet with him, he has a cookie in his hand.
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.
In Super Mario 64 Bloopers: (percent)99(percent) Beroken, Princess Peach runs outside when Bowser claims to be someone selling cookies.
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 Super Mario 64 Bloopers: 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.