In a skillet, heat oil over medium high heat. Add the sausages, stirring and breaking up the pieces into chunks. Cook until most of the juice from the meat has evaporated and the meat is brown, about 5 minutes.

Reduce heat to medium and then add marinara sauce. Cover and let simmer, for 15 minutes, stirring occasionally. Stir in the cheese and chopped fresh basil, cover and remove from the heat.

While the sauce is simmering, cook spaghetti noodles in salted boiling water until tender but firm. Drain in a colander and toss with 1 tablespoon oil to prevent sticking.

To serve, in a large bowl, toss hot pasta with sauce and sprinkle with the grated cheese.