baking tray; baking sheet; sheet pan
A flat metal tray used for baking in an oven. The reading てんパン is specific to this cooking sense; the same kanji 天板 can also be read てんばん with other meanings (e.g., tabletop, soundboard).
See also: 天板 (てんばん)
I arranged the cookies on a baking sheet and put them in the oven.
Please line the baking tray with parchment paper.
Standard kanji spelling for this baking tray sense. Note the special reading てんパン, not てんばん.
Mixed kanji-katakana spelling that makes the reading explicit. Common in recipes and casual writing.
Compound of 天 (てん, 'top' or 'surface') and 板 (いた/ばん, 'board' or 'plate'), with the reading パン possibly influenced by the English word 'pan' or as a phonetic shift for clarity. The exact derivation of the パン reading is uncertain.