Anonymous

Strictly speaking, it should read: "MY buying you food is contingent on YOUR making the cookie". My [noun] is contingent on your [noun]. In this sentence, 'buying' and 'making' are gerunds - 'verbal nouns'

Anonymous

People don't bake just one cookie

Anonymous

"My buying you food" is the correct way to state this.

Anonymous

"My buying food for you is contingent on your making the cookie." I don't understand "making the cookie", but I assume you understand it.

Anonymous

"me" is the object form of I. It makes no sense here. Do you mean My? Sentence must start with a Capital. On making one cookie or cookies?