Begin by preparing the noodles according to the instructions on the package. Once cooked, drain and set aside.

In a large skillet or wok, heat the canola oil over medium-high heat. Add the diced onion and sauté for about 2-3 minutes until it becomes soft and translucent.

Incorporate the minced garlic and ground beef into the skillet, cooking until the beef is fully browned and crumbly, which should take around 5-7 minutes.

Next, add the sliced bell peppers and broccoli florets to the pan. Stir-fry for an additional 3-4 minutes, allowing the vegetables to remain slightly crisp.

In a separate bowl, mix together the soy sauce, oyster sauce, toasted sesame oil, brown sugar, grated ginger, and crushed red pepper (if using). Pour this sauce over the beef and vegetables in the skillet, stirring to combine.

Introduce the drained noodles to the skillet, tossing everything together until the noodles are evenly coated and heated through, about 2-3 minutes.

Plate the stir-fry hot, garnishing with sliced green onions and sesame seeds if desired.