Place a large, dutch oven or pot over medium-high heat; add olive oil.
Once the oil is hot, crumble the spicy Italian sausage into the pan in small chunks. Let it brown on all sides. Remove it from the pot with a slotted spoon and place into a bowl; set aside.
Add the sliced onion into the pan with the sausage drippings. Cook until translucent and lightly browned. Stir often to not burn.
Add the salt and Italian seasoning and basil; stir to combine, then add in the sliced bell peppers. Saute with the onion for about 2 minutes until slightly tender.
Add in the garlic, and cook for one minute. Add in the chicken broth and simmer to reduce for a few minutes, until almost completely absorbed.
Add in the diced tomatoes with their juice, and return the browned spicy Italian sausage back into the pan, and gently fold the mixture to combine; simmer for 3-4 minutes to combine the flavors. Turn the heat to low.
Meanwhile, prepare noodles according to package directions. Drain and add them into the sausage mixture, using tongs to gently toss and combine all.
Serve up in bowls and top with parsley and Parmesan cheese.
Recipe by Mandy's Recipe Box at https://mandysrecipeboxblog.com/italian-sausage-peppers-and-noodles/