Potato and Green Chile Casserole

Name: Potato and Green Chile Casserole
Ingredients: 7 mild New Mexico or Anaheim green chiles (1½ pounds); 4 teaspoons extra virgin olive oil , divided; 2 large onions (½ cup chopped, 2 cups sliced thin); 5 teaspoons minced garlic , divided; 3½ teaspoons kosher salt , divided; 1 teaspoon minced fresh thyme; 1 teaspoon minced fresh rosemary; ½ teaspoon dried Mexican oregano; 1 (14-ounce) can coconut milk; 1 teaspoon extra virgin olive oil; 2 pounds Yukon Gold potatoes , unpeeled, sliced thin (about ⅛ inch thick; 4½ to 5 cups); 1 tablespoon minced fresh chives