Start by cooking your noodles according to the package directions. Once cooked, drain and set aside.
In a large skillet or wok, heat olive oil over medium-high heat. Add diced chicken, season with salt and pepper, and cook until browned, about 5-7 minutes. Remove and set aside.
In the same skillet, add toasted sesame oil, soy sauce, hoisin sauce, rice vinegar, light brown sugar, chili garlic sauce, and ginger. Stir to combine and simmer for a few minutes.
Mix cornstarch with water to create a slurry, then add to the sauce while stirring to thicken.
Return cooked chicken and noodles to the skillet, toss to coat in sauce, and cook for an additional 2-3 minutes. Add red chile peppers if desired.
Garnish with chopped peanuts, sliced green onions, and sesame seeds. Serve hot and enjoy!