Stir the brown sugar, soy sauce, and Sriracha together in a small bowl.
Boil the lo mein noodles until tender, then drain them well.
Lightly whisk the eggs in a bowl.
Melt the butter in a skillet over medium heat, add the crushed red pepper and eggs, and scramble gently without overcooking.
Add the drained noodles and prepared sauce to the skillet, then toss until evenly coated.
Top with optional cilantro and sliced green onion and serve immediately.
Notes
The configured roundup identified Spicy Sriracha Noodles as its first recipe; canonical quantities and steps were extracted from that linked recipe card.