Start by adding 1 tbsp of olive oil into a large pan, add in onion and cook for about 3-5 minutes. Then add in sausage and crumble. Cook until completely cooked through.
Add in tomato sauce and let simmer for about 10 to 15 minutes.
Meanwhile, bring pasta water to a boil with 1-2 tbsp of salt and cook pasta according to package ingredients about 2 minutes.
Once pasta is cooking toss it directly into the sauce and let cook for about 2-4 minutes.
Top with basil and parmesan cheese!