Clean and cut the water parsley and onion into bite-sized pieces.
Cut the chicken breast into cubes.
Cook the pasta in boiling water and set aside.
Heat olive oil in a pan and stir-fry the chicken breast.
Once the chicken is cooked, add the onion and continue stir-frying.
Add the cooked pasta and water parsley, then stir-fry together.
Season with salt and pepper, plate, and serve.