In a medium-sized saucepan over medium heat, whisk together all of the ingredients until well combined. Bring to a simmer and continue to whisk for an additional 5 minutes.
Remove from the heat and let cool for at least 5 minutes.
Use right away or transfer to a jar for storage in the refrigerator for up to 2 weeks.
Recipe by Pastured Kitchen at https://www.pasturedkitchen.com/blog/fed-and-fit-cookbook-bbq-chicken-potato-casserole/