In a wok or large pan, heat 1-2 tbsp of vegetable oil
Cook your chicken until browned and cooked through, mixing with wooden spoon or chopsticks. Remove from pan.
Add a little more oil if needed and add the eggs. Cook until slightly underdone, and then remove. They will finish cooking while they rest and/or when they are added back in later.
Add 1-2 tbsp of oil again to the hot wok. Add garlic and onions and cook 1-2 minutes until fragrant.
Add bell peppers and cook until slightly soft.
Add sauce and noodles. Mix and cook for 1-2 minutes. Keep the heat high so that you can get some caramelization on the noodles with the sauce.
Add a dash of fish sauce, salt, and pepper to taste. You can also add more oyster sauce, soy sauce, or sugar to taste. Then add the chicken and eggs back in.
Mix, and then turn off heat.
Add big green onion slices and bean sprouts. Mix again.
Serve, garnish with small green onion, and enjoy!