For your buttermilk ranch dressing, in a medium bowl combine your mayonnaise and slowly stir in your buttermilk. (If you don’t have buttermilk, see below for how to make your own!)
In a smaller bowl combine the cayenne pepper, ground black pepper, garlic powder, onion powder, and paprika.
Combine your spices and mayonnaise and buttermilk into a single bowl and mix well.