Step 1

In a medium bowl, whisk all ingredients to combine. Transfer the mixture to an airtight container and store in the refrigerator.Notes:

Step 2

When you purchase buttermilk powder at the store, it is found on the shelf, often in the baking section or near the powdered milk.

Step 3

Storage: the brand of buttermilk powder I use (Saco) recommends refrigerating the powder once opened. In my experience, the powder stores for at least 2 months in the refrigerator, as long as you keep it in powder form. If you mix the powder with sour cream or other liquid products, use within 5 days.