Preheat oven to 180° C.
In a large frying pan, heat oil. Add chicken, and sauté for about 3 – 4 minutes, turn over half way during the cooking time, remove chicken and set aside.
Add onion and chili to the pan and sauté until onions are translucent, the add mushrooms and fry gently for a further 2 – 3 minutes.
Return the chicken to the mixture, then add chicken stock. Simmer for a further 8 – 10 minutes.
Make a smooth paste with the corn flour and cream, reduce the heat, and add corn flour paste to the chicken, stir through until sauce is smooth and has thickened. Add thyme, paprika, mustard powder, and lemon juice, and mix through. Season to taste with salt and pepper.
In a large bowl, mix together the pasta and chicken mixture, pour into a greased ovenproof dish.
Sprinkle with breadcrumbs mixed with paprika, and then top with shredded cheese. Bake for 20 minutes, or until cheese is golden in color.