Cook the egg noodles in boiling water according to package directions, then drain and set aside.
In a small bowl, whisk together the soy sauce, brown sugar, oyster sauce, sesame oil, and chili flakes.
Heat vegetable oil in a large wok or skillet over high heat.
Add the sliced chicken to the wok and sear until browned and fully cooked, approximately 5 minutes.
Reduce heat slightly and add the minced garlic and grated ginger, sautéing for 30 seconds until fragrant.
Pour the sauce mixture into the wok and allow it to bubble for 1 minute until it thickens into a sticky glaze.
Add the cooked noodles to the wok and toss vigorously to ensure every strand is coated in the sauce.
Garnish with sliced green onions and toasted sesame seeds before serving.