Thinly slice onion, bell peppers, and mushrooms. Slice the sausages at an angle (diagonal slices) and set aside.
In a small bowl, mix ketchup, Worcestershire sauce, milk, sugar, salt, pepper, and dried basil. Set aside.
Heat a frying pan and cook the sausages. Add onions, bell peppers, mushroom, and stir-fry while seasoning with salt and pepper. Once you are done stir-frying, add in butter and stir together until the butter is spread evenly. Set aside in a plate.
Boil plenty of water in a pot and follow the package instructions to cook the noodles. Once the noodles are cooked, drain well.
Pour in the sauce from Step 2 to a pan and simmer. Stir occasionally.
Once the sauce starts to bubble, add in the sausage and vegetables from Step 3. Mix well. Add in the noodles from Step 4 and stir well. The noodles should be covered entirely.
Place the noodles on a plate, sprinkle on grated parmesan cheese and dried parsley. Enjoy!