It looks like an official Stardew Valley cookbook is on its way. As noticed by GameSpot, Amazon currently has a listing for the book, stating that it will feature over 50 recipes based on the game and will be arriving in 2024.
Specifically, we're told that the book will span 176 pages, will feature recipes for spring, summer, autumn, and winter, and will be debuting on April 16, 2024, all for a price of £21.56.
As for some of the recipes, the description for the book eludes to a few:
There is also said to be a digital Kindle version for £8.99, if you would prefer not to purchase the hardcover physical edition.