Cider-Braised Chicken Thighs with Caramelized Apples

Name: Cider-Braised Chicken Thighs with Caramelized Apples
Ingredients: 6 bone-in, skin-on chicken thighs, about 2 1/2 lb. (1.25 kg) total; Kosher salt and freshly ground pepper; 1 Tbs. olive oil; 3 large shallots, sliced; 2 garlic cloves, minced; 1 1/2 Tbs. chopped fresh rosemary leaves; 1 cup (8 fl. oz./250 ml) apple cider; 1/2 cup (4 fl. oz./125 ml) low-sodium chicken broth; 2 Tbs. cider vinegar; 2 1/2 Tbs. unsalted butter; 2 Granny Smith apples, peeled, cored and cut into slices 1/2 inch (12 mm) thick