Boil 3-4 cups of water in a pan. Add 1 pack of noodles and cook according to the package directions. Make sure the noodles are al dente (slightly firm to the bite), not overcooked.
Drain, rinse under cold water, and toss with a little oil to prevent sticking. Set aside.
Heat a large wok or wide-bottom pan on medium-high heat and add sesame oil (or any cooking oil).
Once the oil is hot, add minced garlic, white spring onions, and stir for 30 seconds until the raw smell of garlic goes off.
Then add all of your veggies, like sliced onion, carrot, bell peppers, cabbage, and sugar and salt. Increase the heat to high, and saute for 2-3 minutes. Vegetables should remain crunchy, so avoid overcooking.
Once veggies are cooked, reduce the heat to medium-low and add the boiled noodles (around 2 cups), dark soy sauce, red chili sauce, green chili sauce, white vinegar, salt, and black pepper powder. Carefully toss them so that they are well coated with the sauce and the veggies.Remove from heat, garnish with sliced spring onions, and serve veg hakka noodles hot.