Stuffed Banana Peppers

Name: Stuffed Banana Peppers
Ingredients: 1 (8-ounce) can no-salt-added tomato sauce; 1 (10-ounce) package frozen chopped spinach, thawed; 8 ounces sweet or hot Italian turkey sausage (2 links), casings removed; ⅓ cup stemmed, seeded and chopped pickled hot cherry peppers; ⅓ cup thinly sliced fresh basil, plus basil leaves for garnish; 3 tablespoons whole-wheat panko; 1 tablespoon finely chopped garlic; ⅔ cup grated Pecorino Romano cheese, divided; 3 tablespoons extra-virgin olive oil, divided; 8 medium fresh banana peppers (1 1/2 lbs.)