Prepare Noodles: Cook the lo mein noodles according to package instructions, drain, and rinse under cold water; set aside.
Make the Sauce: In a small bowl, whisk together soy sauce, lime juice, sugar, Sriracha, and sesame oil; set aside.
Cook Shrimp: Heat vegetable oil in a wok over medium-high heat, add shrimp, and cook for 2-3 minutes per side until pink; remove from the wok and set aside.
Stir-Fry Vegetables: In the same wok, add more oil if needed, stir-fry bell peppers, baby bok choy, and mushrooms for 3-4 minutes until tender-crisp.
Add Aromatics: Push vegetables to one side, add minced garlic and grated ginger to the empty space, cook for 30 seconds until fragrant.
Combine and Sauce: Return cooked shrimp to the wok, add cooked noodles, pour the sauce over, and toss until well coated and heated through.
Finish and Garnish: Stir in sliced scallions, garnish with sesame seeds and chopped cilantro if desired.
Serve: Enjoy your Shrimp Lo Mein hot for a flavor-packed homemade takeout experience!