"They eat my pasta."
Translation:Ils mangent mes pâtes.
The English word "pasta" is Italian in the first place, and used to define spaghetti, macaroni... ie a collective singular word.
It is not the case in French, where "les pâtes" is a plural form which differentiates it from the singular "pâte" which is everything with the same texture as a dough (can be thick tomato paste, for example).
So, "I want to eat pasta" = "voglio mangiare la pasta" = "je veux manger DES pâtes".