Combine mayonnaise, sour cream, and buttermilk in a medium mixing bowl. Stir well using a whisk.
Add parsley, dill weed, black pepper powder, onion powder, garlic powder, smoked paprika, cayenne pepper powder, and salt, and mix well with a whisk.
Check for salt and add more if needed.
Let the mixture sit in the fridge for about 30 minutes before serving.
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Notes
If you don't have buttermilk, you can easily substitute it with milk and vinegar. Add 1 tablespoon of vinegar to a cup of milk and let it sit for 5 minutes. This will give you the same consistency and flavor as buttermilk.Add milk or cream to the mixture if you want a slightly thinner dressing.If you want a thicker ranch, add extra mayonnaise to this recipe.Let the dip sit in the fridge for about 30 minutes. This will bring out the flavors.Add more cayenne pepper to the mixture for a spicier dressing; omit the cayenne pepper altogether for a milder dressing.