In a small bowl, whisk together soy sauce, hoisin sauce (or oyster sauce), brown sugar, sesame oil, and chili garlic sauce. Set aside.
In a large pot of boiling water, cook noodles according to package directions; drain well.
Heat sesame oil in a large nonstick skillet over medium-high heat. Add garlic, ginger, mushrooms, bell pepper, and carrot. Cook, stirring frequently, until tender, about 3-4 minutes. Stir in snow peas and sauté until tender, about 2-3 minutes.
Stir in the scallions and egg noodles along with the sauce mixture, and gently toss to combine.
Serve immediately.