Bring a large pot of water to a boil and cook the lo mein noodles according to package instructions.
Drain the noodles and rinse under cold water to stop the cooking process.
In a large skillet or wok, heat the vegetable oil over medium-high heat.
Add minced garlic and stir-fry for about 30 seconds until fragrant.
Add sliced bell peppers and snap peas, stir-frying for 3-4 minutes until slightly tender.
Toss in the cooked lo mein noodles with the vegetables.
Drizzle soy sauce and oyster sauce over the noodles, tossing to coat evenly.
Add sesame oil and chopped green onions, mixing everything well.
Cook for an additional 2-3 minutes, allowing flavors to blend.
Serve hot, garnished with sesame seeds.