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A type of biscuit, they created them in 1994 and charged seven sickles for each. They had the appearance and taste of ordinary custard creams, but when eaten, they transfigured the eater into a large canary. Within a minute, the person would moult their feathers and revert to their normal human form.
- "Oh — sorry, Neville! I forgot — it was the custard creams we hexed —"
- — Fred Weasley to Neville Longbottom[src]
Neville Longbottom ate one during a celebration party for Harry Potter's triumph over the Hungarian Horntail in the First Task of the Triwizard Tournament, in late 1994. He had just bitten into it when he overheard Fred offering Hermione Granger a jam tart and telling her that the tarts were not hexed, but the custard creams were. Neville immediately spat the food out, but when mistakenly reassured that Fred was joking, he returned to the consumption of the canary creams. He soon caused a diversion by turning into a large canary, proving Fred's memory incorrect. Within a minute, he reverted, and joined in the laughter.
- Harry Potter and the Goblet of Fire (First appearance)
- Wizarding World
- Harry Potter: Wizards Unite
- The Wizarding World of Harry Potter