This is the man in Sanctuary who comes to the conjure woman for one of her spells, for which she wants to charge him a dollar; he wears "a torn singlet strapped into overalls" (271).
In The Mansion one of the two black servants who work for Flem in his mansion is referred to as the "Negro cook" (172). She is referred to by several characters and the narrator, and she passes close to Mink in the dark as she leaves the mansion to go home, but she is never described.
In The Mansion Houston hires this woman "to cook" for him after his wife is killed (11), so presumably she is not the same cook as the one mentioned in The Hamlet, who cooks for Mr. and Mrs. Houston during the first two months of their marriage.
In The Hamlet, during the two months they occupy their new house the Houstons hire a "negro woman to cook" for them (238). Besides the woman who cooks for the Varners, she is "the only other hired cook, white or black, in the country" (238).
Both The Hamlet and The Town mention the woman who cooks for the Varners. In the first novel, is mentioned as a sign of Will Varner's relative wealth. The narrator calls her the "only" servant of any sort in the whole district" (11) - though later the novel mentions two other Negro servants, a man and a woman, who work for Houston after his marriage. The Town describes the early hour at which she is forced to rise to cook Varner's breakfast for him (313).
In Intruder in the Dust Gavin Stevens describes seeing "[Sheriff] Hampton's cook" sitting in his kitchen eating greens with Lucas Beauchamp (219). Gavin does not describe the cook at all, but it seems safe to assume that she is a Negro woman; for one reason, all but one of the cooks in the Yoknapatawpha fiction are, and for another, she is eating at the same table as Lucas. Earlier Gavin calls her "a hired town cook," who gets to the Sheriff's house "at a decent hour about eight" (106).
This is the older of the two Negroes who work in Rogers' restaurant in Flags in the Dust. The narrative does not explicitly call him the cook, but since it describes the cooking that is going on and identifies the "younger of the two," Houston, as the waiter, it seems safe to assume this older Negro is the cook.
In "Monk" Warden Gambrell has an unnamed Negro cook who works in his house as a trusty; when the warden's pistol goes missing, he has the cook "severely beaten" on the assumption that he stole it (53). Historically, there were female prisoners at Parchman's, but in this story it seems more likely Faulkner is thinking of the cook as male.
Nothing is known about the cook in The Unvanquished whom Ringo "flings aside" when he enters the Wilkins house to tell Bayard that John Sartoris is dead, but it can safely be inferred that she is both female and black (212).