In a medium bowl, add onion and vinegar; set aside. In a large bowl, mix together the olive oil, capers, olives, chili flakes, oregano and/or basil.
Add the marinated onions to the olive mixture, then combine with the chicken, pasta, and parsley. Add salt and black pepper to taste. Serve warm, at room temperature, or chilled. Serves 4.
Approximate Nutrient Analysis per serving (not including salt to taste):
350 calories, 14 g fat, 1.5 g saturated fat, 85 mg cholesterol, 300 mg sodium, 26 g carbohydrate, 0 g fiber, 2 g sugar, 29 g protein