Heat Oil In A Large Skillet Over Medium Heat. Add Chicken, Onion And Garlic; Saute Until Chicken Is Mostly Cooked Through, About 10 Minutes. Stir In The Crushed Tomatoes, Mushrooms And Italian Seasoning. Cook For About 5 Minutes, Stirring Frequently. Reduce Heat And Stir In The Sugar. Simmer For At Least 15 Minutes. Meanwhile, Bring A Large Pot Of Lightly Salted Water To A Boil; Add Rotini Pasta And Cook Until Al Dente. Drain And Serve Topped With The Chicken Mixture And Grated Parmesan Cheese.