In a large mixing bowl, combine first 8 ingredients; mix well.
Store in airtight container in a cool dry place. YIELD: 3 cups mix (enough to make 24 batches of ranch salad dressing). For Ranch Salad Dressing: In a bowl, whisk together 2 tablespoons of mix with mayonnaise and buttermilk.
Refrigerate until serving.
For Thousand Island Dressing: Add chili sauce and pickle relish to 1 cup prepared ranch dressing.
For Cucumber Dressing: Add cucumber and celery seed to 1 cup of prepared ranch salad dressing.