Cut the bacon and onion into bite-sized pieces.
Boil the spaghetti noodles in boiling water.
Add olive oil to a pan and fry the bacon.
Add the onions and sauté together.
Add the cooked pasta to the pan and mix with the ingredients.
Pour in the pasta sauce and stir-fry well.
Serve on a plate and sprinkle with Parmesan cheese.