Place all the ingredients in a medium bowl. Whisk to combine.
1 cup mayonnaise, ½ cup buttermilk, ¼ cup whole milk, 1 teaspoon garlic powder, 1 teaspoon onion powder, ¾ teaspoon chipotle powder, ¾ teaspoon salt, ½ teaspoon dried dill, ¼ teaspoon ground black pepper