I’m trying to find a chapter book about a young boy and an older woman who search for a prize-winning cookie recipe.
They want to win a cookie baking competition, so the older woman searches the library in her house for her family’s best recipe. She either loses it or can’t find it. She had a pet named Peeves who might have been responsible somehow. She realizes that they can use the second-best recipe, which originally belonged to one of her female relatives, if they can find it in time. The search takes them to either a shack or an abandoned house on a hill where they find a recipe for aniseed cookies. There may have been ghosts or a graveyard involved. The old woman rushes home and bakes the cookies in time for the contest, where they win first prize.
The book was for middle readers; I think it was about the same length as an Encyclopedia Brown book. I read the book before the year 2000, and I’m fairly sure it was written after 1960.