Combine Ingredients: In a medium bowl, combine all the dried herbs and spices. If using dry buttermilk powder, add it to the mix.
Mix Thoroughly: Use a whisk or a food processor to mix the ingredients thoroughly until you have a fine powder.
Store: Transfer the ranch seasoning mix to an airtight container, such as a mason jar, to keep it fresh. Store in a cool, dry place, like your spice cabinet.