Boil the pasta in boiling water.
Finely chop the onion and garlic.
Cut the chicken breast into bite-sized pieces.
Heat olive oil in a pan and sauté the garlic and onion.
Add the chicken breast and cook until done.
Add tomato sauce and mix well.
Pour in the heavy cream and bring to a simmer.
Add the cooked pasta to the sauce and toss to combine.
Season with salt and pepper.
Finish with parsley and serve.