Heat the oil in a large wok, and add the onion, red and yellow peppers, baby corn, and mushrooms. Stir fry over a medium-high heat for a few minutes, until nearly tender. Then add the curry paste, and cook for 2 more minutes.
Meanwhile, boil the bean pasta for around 6-7 minutes, until cooked al dente. Drain the pasta, and add it to the wok with the vegetables and curry paste.
Mix everything well, and add the vegetable stock. Season to taste (you probably won't need extra salt unless you used low sodium stock). Bring to a boil, and serve topped with more spring onions and some fresh coriander (cilantro).