Made this many times. Never fails! From Barefeet in the Kitchen
3/4 cup mayonnaise
3/4 cup sour cream
1/4 - 3/4 teaspoon dried dill weed
1/2 teaspoon dried parsley
1/2 teaspoon dried chives
1/2 teaspoon granulated garlic or garlic powder
1/4 teaspoon granulated onion or onion powder
1/8 teaspoon kosher salt, adjust to taste
1/8 teaspoon freshly cracked black pepper
1 - 2 teaspoons fresh lemon juice or white vinegar