Cook pasta in a large saucepan of salted, boiling water, following packet directions until tender. Drain pasta in a colander and pour into a deep baking dish. Set aside.
While pasta is boiling, pan fry in a large and deep frying pan/skillet, onion and carrot until onion is transparent. Add the chicken, broccoli and mushrooms, and cook until chicken has browned and broccoli has softened slightly. Stir through garlic, cooking cream, stock powder and salt (adjust to your tastes). When cream begins to simmer, remove from heat and stir through 1/2 cup parmesan cheese. Pour Creamy Chicken onto pasta and stir through really well to combine.
Change oven setting to grill/broil on medium heat. Sprinkle pasta and chicken mixture with remaining cheese, and place into oven to brown on top.
When golden on top, remove from oven and serve!
Notes
Make sure to taste test the creamy chicken sauce before pouring it over the pasta to ensure the flavours a to your taste, add in salt or choice of seasoning if needed.