Cook the noodles according to package instructions. Drain and set aside. Rinse with cold water if needed to prevent sticking.
Prepare the sauce by whisking together coconut aminos, hoisin sauce, broth, and arrowroot flour in a small bowl.
Cook the beef by heating avocado oil in a large skillet over medium-high heat. Add garlic and sauté for 2-3 minutes until fragrant.
Add ground beef and ginger, breaking apart the beef as it cooks. Cook until browned, about 5-7 minutes. Drain excess fat if needed.
Pour in the sauce and stir well. Let simmer for 1-2 minutes until the sauce thickens.
Add the cooked noodles, tossing everything together to coat evenly.
Remove from heat and stir in green onions and sesame seeds.
Serve hot and, if desired, sprinkle with red pepper flakes for spice.