Boil noodles as per package instructions. Drain and soak in cold water for about 2 mins to prevent them from cooking further. Drain and mix with 1 tbsp vegetable oil to prevent them from sticking. Set aside.
In a small container, mix the sriracha sauce, ketchup, vinegar, and soy sauce. Set aside.
In a wok or large frying pan, heat 2 tbsp oil to sizzling. Add ginger and garlic pastes. Stir fry for a minute then add the white part of the spring onions. Stir fry for another minute.
Add the red and green bell pepper, carrots & stir fry until these veggies are partially cooked (about 2 minutes). Add the cabbage and stir fry for another minute.
Add the sauce mixture. Mix well and then do a quick taste for salt and pepper. Add the drained noodles & mix until all is well combined. Add half of the green part of the spring onions (reserve half for garnishing) and stir fry for 2 minutes, until noodles are hot. Serve immediately with garnish of remaining spring onions.