Heat Oil In 12-Inch Nonstick Skillet Over Medium Heat. Add Onion And Mushrooms And Cook For 5 To 7 Minutes Or Until Onion Is Lightly Browned. Add Sausage Slices, Salt And Pepper. Cook For 3 To 5 Minutes To Brown, Stirring Frequently. Stir In Wacky Mac And Serve Immediately.