Heat Oil In Very Large Nonstick Skillet Over Medium Heat. Add Onion, Garlic And Mushrooms. Cook For 7 To 10 Minutes, Stirring Frequently, Or Until Vegetables Are Tender. Stir In Sausage, Oregano And Red Pepper Flakes. Brown Sausage For 2 To 3 Minutes, Stirring Occasionally. Add Tomatoes And Wine. Cook Over Medium-High Heat For 2 Minutes, Or Until Tomatoes Are Pulpy, Stirring Frequently. Season With Salt And Pepper. Stir In Wacky Mac And Heat Through Over Medium Heat. Scatter Mozzarella On Top. Heat Through For 1 To 2 Minutes.