Gather the ingredients so you have everything close at hand on the counter or table.
Prepare the Ranch Dressing Mix
Combine the 12 dressing ingredients in a food processor bucket. Whirl together until crumbs are very small. Store this in an airtight container. This will make a little over 3 cups and will keep for up to a year in a cool, dry place.
Make the Homemade Ranch Dressing
Place mayonnaise in a medium mixing bowl and add to that the sour cream and Ranch Dressing Mix. Stir together until combined.
Gradually add in the buttermilk, mixing together with a whisk until completely blended. Season with kosher salt and freshly ground black pepper. Taste and add more seasonings, if desired.
Pour into a pint jar or serving vessel. Cover and allow to chill for 4 hours. Pour over your favorite lettuce salad. This will make a little less than 2 cups of dressing.
Notes
*Use Ranch Dressing Mix to make Homemade Ranch Dressing, Ranch Veggie Dip, or as flavoring in other recipes.