Cut the Italian sausage into bite-sized pieces.
Finely chop the onion and garlic.
Heat olive oil in a pan and cook the sausage until golden brown.
Add the chopped onion and garlic, and sauté.
Add tomato sauce and bring to a simmer.
Add gnocchi and cook until tender.
Season with salt and pepper to taste.
Finish with Parmesan cheese and basil.