Heat a 6qt sauce pot on medium heat. Let olive oil sizzle, then add in chopped white onion, mushrooms, and tomatoes.
Pour in jars of Alfredo sauce. Swirl 1/4 cup of water around jar to ensure you get all of the sauce out. Pour in water.
Add noodles and cook for about 20 minutes - until the noodles are al dente. Garnish with extra parmesan. Enjoy!