Begin by bringing a large pot of salted water to a boil. Add the dry Lo Mein noodles and cook according to package instructions until al dente. Drain the noodles in a colander, rinse with cold water to stop the cooking, and set aside.
In a large wok or skillet, heat the cooking oil over medium-high heat. Once hot, add the minced garlic and sauté for about 30 seconds until fragrant, being careful not to burn it.
Add the shrimp to the pan, cooking for about 2-3 minutes until they turn pink and opaque. Stir frequently to ensure even cooking. Once cooked, remove the shrimp from the pan and set aside.
In the same pan, add the sliced bok choy and red bell pepper. Stir-fry for about 3-4 minutes until the vegetables are tender yet still crisp.
Return the cooked shrimp to the pan with the vegetables. Add the cooked Lo Mein noodles, oyster sauce, soy sauce, dark soy sauce, and chicken broth. Toss everything together until the noodles are well coated and heated through, about 2-3 minutes.
Drizzle the sesame oil over the noodle mixture and give it one last toss to combine. Remove from heat.
Plate the Shrimp Lo Mein in bowls, sprinkling with white sesame seeds for garnish. Serve immediately and enjoy!