2 tablespoons oil (sesame works best) 
8 oz button mushrooms (sliced (see notes for substitutes)) 
2 peppers (sliced (any color works; see notes for substitutes)) 
3 spring onions (sliced (see notes for substitutes)) 
1 pound chicken breast (diced) 
4 tablespoons soy sauce 
2 teaspoons cornstarch 
1/2 cup chicken broth (plus more as needed) 
8 oz spaghetti (cooked according to package directions (spaghettini, Linguine or Ramen noodles all work, too))