I have several hundred-year-old church cookbooks. All of them contain favorite recipes of individuals affiliated with the church publishing the cookbook. These cookbooks were also created for fund-raising purposes. The published cookbooks were sold. They also all have advertising sections at the back. Then (as well as now), selling ads to local businesses increased the profits. A 1925 cookbook compiled by the Sisters of St. Joseph in St. Paul, Minnesota has a page in the book right before the advertisements calling attention to the ads. And, here’s one of the pages which contained ads:

The Sisters probably solicited ads from members of the church who owned businesses or from vendors who sold products to the church.
