Chinese noodles w/ chicken and veg

Chicken second courses

6-7 skinless, boneless chicken breast fillets/ strips 1 tablespoon vegetable oil or 1 tsp sesame seed oil 4 scallions chopped (greens will be added when the dish is nearly ready) 1 pack button mushrooms 1 green bell pepper chopped Chinese noodles or thin spaghetti ½ cup tomato puree 1 tbsp ginger garlic ready minced (or fresh)