In a lidded jar, combine the mayonnaise, milk, parsley, dill, garlic powder, salt, and black pepper. Cover with lid, seal, and shake to combine. Refrigerate and use for up to a week.
For the Salad:
Place the chopped lettuce into a large serving bowl.
In one row, place the sliced avocado over the lettuce, repeat with remaining ingredients, ending with the sliced eggs. Drizzle with Ranch dressing and additional buffalo sauce. Toss to combine.