This one is definitely tried and true!

Ranch Dressing/Dip
Courtesy Cindy5NY

1 cup mayonnaise
1/4 cup buttermilk (more if needed to thin)
1 T lemon juice
1 T cider vinegar
1/4 tsp garlic powder (or 2 cloves garlic, minced)
1/2 tsp onion powder (or 2 T fresh minced chives or scallion)
1/4 tsp salt
1 T parsley flakes

Optional add ins:
1 T coarsely cracked peppercorns (or to taste)
2-3 T fresh grated parmesan
1 T dijon mustard

Combine ingredients, whisk until smooth. Chill before serving.
Note - if using fresh garlic and scallion, shelf life is shorter.

*for lower fat, use 3/4 cup buttermilk and 1/2 cup mayo.

I feel strongly about it and love learning more on this topic. If possible, as you gain expertise, would you mind updating your blog with more information?

Here is a link that might be useful: ranch brokers