Cook the noodles according to package instructions; drain and set aside.
Heat vegetable oil in a large frying pan or wok over medium-high heat.
Add the minced garlic and ginger to the pan, sauté for about 30 seconds until fragrant.
Toss in the sliced bell peppers, carrots, and snap peas; stir-fry for about 3-4 minutes until vegetables are tender-crisp.
Push the vegetables to one side of the pan and add your choice of protein, cooking until it is no longer pink (about 4-5 minutes).
Add the cooked noodles along with the soy sauce, oyster sauce (if using), sesame oil, and black pepper. Stir everything together to combine.
Finally, add the chopped green onions and stir-fry for an additional 1-2 minutes until heated through.
Serve hot, garnishing with more green onions if desired.