In a small mixing bowl, whisk together the mayonnaise, sour cream, dijon mustard, apple cider vinegar, granulated sugar, garlic powder, onion powder, kosher salt, and black pepper until fully combined and creamy. Set the dressing aside.
3/4 cup mayonnaise, 1/4 cup sour cream, 1 tablespoon dijon mustard, 1 tablespoon apple cider vinegar, 1 teaspoon granulated sugar, 1 teaspoon garlic powder, 1 teaspoon onion powder, ½ teaspoon kosher salt, ¼ teaspoon black pepper