Cook pasta according to directions on packet, drain, keep warm.
Heat oil in pan, add onion and garlic, cook 1 minute. Add the chicken and mushrooms, cook 2 minutes, or until cooked through. Add the capsicum tp pan.
Combine evaporated milk, cornflour, and mustard, and add to chicken mix bring pan to boil, then simmer 1 minute.Remove from heat and while still hot stir in the spinach leaves, and spring onions, stir so as spinach wilts through a little.
Serve over pasta, sprinkle with cheese, top with pinenuts.