Cook the lo mein noodles and broccoli florets. Set aside.
Season the beef and cook in a skillet. Set aside.
Cover the beef and set aside. Cook the veggies with garlic in a skillet.
Stir together the sauce ingredients: brown sugar, soy sauce, hoisin sauce, sriracha, and oil.
Add veggies, beef, and noodles together. Pour in sauce and toss to combine.
Garnish with sesame seeds and green onion. Serve and enjoy!