Begin by cooking the lo mein noodles according to the package instructions. Drain and set aside. Drizzling a bit of sesame oil on the noodles will prevent them from sticking together.
In a small bowl, whisk together the lime juice, light brown sugar, soy sauce, Sriracha, and grated ginger. Set the sauce aside for later.
In a large skillet or wok, heat 1 tablespoon of sesame oil and the butter over medium heat. Once melted, add the lightly beaten eggs. Scramble the eggs until fully cooked, then transfer them to a plate and set aside.
In the same skillet, add another teaspoon of sesame oil and increase the heat to medium-high. Toss in the shrimp and sauté until they turn pink and opaque, about 2-3 minutes. Remove the shrimp and set aside.
Add the minced garlic, frozen broccoli, and red bell pepper strips to the skillet. Stir-fry for about 3-4 minutes until the vegetables are heated through and slightly tender.
Return the cooked shrimp and scrambled eggs to the skillet. Pour the prepared sauce over the mixture and add the cooked lo mein noodles. Toss everything together until well combined and heated through, about 2-3 minutes.
Taste the lo mein and add salt if needed. Sprinkle with crushed red pepper flakes for an extra kick. Serve hot and enjoy your delicious 20-Minute Shrimp and Broccoli Lo Mein!