Each month, Goodberry's releases their Flavor of the Day calendar in the form of an image on their website. I suggested some improvements to their process, but I didn't hear back from them. So, I made it myself!

When Goodberry's releases their Flavor of the Day calendar, I add the flavors to a Google Calendar. The Shortcut then reads the calendar, using the public link, and returns the Flavor of the Day for a given day. Having the Shortcut installed on your device will also allow you to ask Siri for the Flavor of the Day.

Additionally, the Shortcut will ask if you'd like to subscribe to the Google Calendar so that you can see the Flavor of the Day as an all-day event on your mobile device.