Chicken Puttanesca Recipe

Name: Chicken Puttanesca Recipe
Ingredients: 2 tablespoons olive oil; ½ white onion, chopped; 3 cloves garlic, minced; 1 teaspoon crushed red pepper flakes; 3-4 anchovy fillets, drained and chopped; One 28-ounce can crushed San Marzano tomatoes; 1 cup Kalamata olives, pitted and chopped; 2 tablespoons capers, drained; 2-3 medium-sized boneless skinless chicken breasts, cut into bite-sized pieces; Salt and pepper, to taste; 16 ounces rotini, or other short, cut pasta; Parmesan cheese, for garnish (optional)