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Preheat the oven for 350 degrees. In a large pot, boil the pasta. While the pasta is cooking, go ahead & cook your onion & ground beef together in a large skillet or pot until completely cooked through. In the same pot as the beef, you will add in your sour cream, your Classico sauce, one cup of the mozzarella, & finally your noodles (once they’ve been cooked & strained, of course). Give it all a good stir to ensure everything is mixed together nicely. Next, spread the pasta mixture straight into a casserole dish & add your last cup of cheese right on top. Cover it with tinfoil & bake for 30 minutes. Once your 30 minutes is up, remove the tinfoil & bake for an additional 5-10 minutes to get a golden crust on the cheese.