Cook the noodles according to package instructions. Drain and set aside.
In a large skillet or wok, heat the vegetable oil over medium-high heat.
Add the shrimp and cook for 2-3 minutes until pink and cooked through. Remove from the skillet and set aside.
In the same skillet, add the garlic and sauté for 30 seconds until fragrant.
Add the bell pepper, broccoli, and carrot. Stir-fry for 3-4 minutes until the vegetables are tender-crisp.
Return the shrimp to the skillet and stir to combine.
In a small bowl, mix soy sauce, oyster sauce, sesame oil, and the cornstarch mixture. Pour the sauce over the shrimp and vegetables.
Add the cooked noodles and toss everything together until evenly coated in the sauce. Cook for another 1-2 minutes.
Season with salt and pepper to taste. Serve hot, garnished with green onions and sesame seeds.