Cook the egg noodles according to package instructions. Drain and set aside.

In a large skillet, heat the vegetable oil over medium heat. Add the ground beef and cook until browned, breaking it apart with a spatula, about 5-7 minutes. Drain excess fat if necessary.

Add the minced garlic and ginger to the skillet, cooking for an additional 1-2 minutes until fragrant.

Stir in the soy sauce, brown sugar, rice vinegar, and red pepper flakes (if using). Mix well and let simmer for about 3-5 minutes.

Add the cooked egg noodles, green onions, and bell peppers to the skillet. Toss everything together until well combined and heated through, about 2-3 minutes. Season with salt and pepper to taste.

Serve hot, garnished with additional green onions if desired.