In The Symphony Verse, Blaine loves chicken, to the point where his friends bring him chicken when he's sad even if it's not dinnertime, simply because it cheers him up.
The boys of Dalton Academy in Dalton are absolutely crazy about Kurt's cookies. Especially Windsor boys, but effective to Stuarts as well. Kurt has no idea why, stating that his cookies are normal, it's just that the people who eat them are off their rockers.
Deconstructed in Princess Celestia Hates Tea. Everyone in Equestria and beyond adamantly believes tea is Celestia's favorite beverage. When she tries to come clean and admits that she actually hates the stuff, her subjects refuse to believe it and accuse her of being the Changeling Queen or Discorded.
In Cori Falls's works, Jessie is insanely fond of French Toast to the point where James can soften her up in her worst moods just by preparing it. She also loves strawberry cheesecake. James is partial to Belgian waffles, Gary likes custard dishes. Meowth's love of fish is merely Stock Animal Diet at work. On the "villains" side, Tracey favors Mountain Dew and pretty much every junk food there is, while Ash is obsessed with cheeseburgers.
One of Yoshizilla Rhedosaurus' infamous Long Runner fics goes by the name of Meloetta's Icing Fetish. The title says it all, really. She specifically likes vanilla icing.
Stephen Ratliff's Marissa Picard, the youngest person to become Captain of the Enterprise (at age 9!) loves everything strawberry flavored. Jelly, ice cream, sodas, anything. She is particularly fond of strawberry juice.
In Bait and Switch (STO) Captain Kanril Eleya loves jumja sticks, a Bajoran sweet that resembles a large lollypop. In chapter three she makes a point of bringing a large takeout box of cooked, not replicated, jumja sticks back to her ship with her. Few chapters go by without at least a mention of them.