Chipotle and Roasted Garlic Mashed Potatoes

Name: Chipotle and Roasted Garlic Mashed Potatoes
Ingredients: ¾ teaspoon salt; 4 pounds russet, golden, or baking potatoes, peeled and quartered; 1½ tablespoons unsalted butter; ½ head garlic, roasted (see Notes); ¾ cup milk (skim for lowest fat or evaporated skim for a richer flavor); 2 dried chipotle chiles, reconstituted and minced