Mix all ingredients in a jar and shake until well combined. May also use a whisk to combine. Refrigerate in covered container for up to a week.
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Notes
This dressing will keep in your refrigerator for up to a week, depending on the use-by dates of your yogurt, buttermilk, and mayo. Shake it well before serving.
Garlic Ranch Dressing: Use fresh garlic (1 clove garlic, minced) instead of garlic powder. Flavor will intensify over time.