Bring A Large Pot Of Lightly Salted Water To A Boil. Add Pasta And Cook For 8 To 10 Minutes Or Until Al Dente; Drain And Reserve. Meanwhile, Season Chicken With Salt And Pepper, Basil, Rosemary, Cajun Seasoning, And Red Pepper Flakes. Heat Oil In A Large Skillet Over Medium Heat; Add Chicken And Cook Until Browned. Remove Chicken From Skillet And Stir In Garlic And Onions; Cook And Stir Until Clear. Return Chicken To Skillet Over Onion Mixture And Add Broth. Simmer Until Chicken Is Cooked Through And No Longer Pink Inside; Spread Mixture Over Pasta And Serve.