1.
Heat olive oil in a large skillet over medium heat; add cubed chicken pieces. Season with salt and pepper; cook until chicken is browned on all sides, stirring occasionally.
2.
Add halved grape tomatoes, sliced mushrooms and parsley; frequently stirring, continue to cook for 3 to 4 minutes, or until chicken is thoroughly cooked.
3.
Add cooked fettuccine to chicken mixture and cook until heated through, stirring frequently.
4.
In a mixing bowl or a jar, combine olive oil, lemon juice, garlic, salt and pepper; shake it or stir it until thoroughly mixed. Stir into pasta mixture.
5.
Remove from heat and taste for salt and pepper; adjust accordingly.
6.
Sprinkle with grated Parmesan cheese and serve!