Guys, please help me with that one .. In which ep did House and Cameron hang out eating sweets ?!

If あなた mean were they go to monster truck 表示する and キャンディー floss at he end it was:
Season 1 episode 12 "Sports Medicine"

Sorry if it not that one

i think you're talking about episode 12 in the sesaon 1 [Sports Medicine].

house takes cameron to see monster trucks and in the end they're eating cotton candy.

Like the guys said, it could be the one where they go to the monster trucks.

There's also this time when Cameron brought キャンディー canes to the office for クリスマス on the episode "Damned if あなた Do"