Braised Chicken with Squash and Pepitas

Name: Braised Chicken with Squash and Pepitas
Ingredients: 2 lb. (1 kg) bone-in, skin-on chicken thighs; Kosher salt and freshly ground pepper; 1 Tbs. extra-virgin olive oil; 1/2 yellow onion, thinly sliced; 1/2 small butternut squash, peeled, seeded and cut into 1/4-inch (6-mm) slices; 1 Tbs. finely chopped fresh sage, plus sage leaves for garnish; 1/2 tsp. freshly ground nutmeg; 1/4 tsp. paprika; 1/4 cup (2 fl. oz./60 ml) white wine; 1 1/2 cups (12 fl. oz./375 ml) chicken stock, plus more as needed; 2 Tbs. pepitas (toasted pumpkin seeds)