Sweet Potato and Green Chili Quesadillas with Arugula

Name: Sweet Potato and Green Chili Quesadillas with Arugula
Ingredients: 2 sweet potatoes, about 1 lb. (500 g) total, peeled and cut into 1/2-inch (12-mm) pieces; 4 Tbs. (2 fl. oz./60 ml) plus 2 tsp. olive oil; 8 flour or corn tortillas, about 9 inches (23 cm) in diameter; 3 cups (12 oz./375 g) shredded Monterey jack cheese; 1 can (4 oz./125 g) roasted green chilies, drained; 1/3 cup (1/2 oz./15 g) fresh cilantro leaves; 4 oz. (125 g) baby arugula; Juice of 1/2 lemon; Salt and freshly ground pepper, to taste