Cook the LoMein noodles according to package instructions; drain, rinse, and set aside to cool.
Heat peanut oil in a large skillet over medium-high heat. Add ground beef and ¼ cup sliced green onions; cook, stirring frequently, until beef is browned and no pink remains, about 5-6 minutes.
In a small bowl, whisk together chicken broth, Mirin, soy sauce, minced garlic, grated ginger, sesame oil, and sriracha if using.
Add cooked noodles, coleslaw mix, and sauce mixture to the skillet with the ground beef.
Gently toss all ingredients together using tongs and cook for 2-3 minutes, allowing the sauce to reduce and coat everything evenly.
Transfer to a serving dish and garnish with the remaining 2 tablespoons of sliced green onions.