All good! "Fell" is the past tense of "fall". Aternatively in some cases you could say "did fall", though in modern English that's usually used as an affirmative to a question about the fallen status of the chocolate (e.g. [which is short for the Latin "exemplia gratia" , meaning "for example"], Question: "Did the chocolate fall?" Answer: "Yes, the chocolate did fall" or "Yes, it did fall").

There are actually other (irrelevant) meanings of the word "fell"; as an adjective in "a fell beast" for example, "fell" means "fierce, cruel, terrible, or dreadful"; or as a verb meaning "to knock, strike, shoot, or cut down; cause to fall" for example " to fell a moose" or "to fell a tree."