If using fresh wide rice noodles, separate and rinse briefly under warm water. For dried noodles, soak in warm water for 25 to 30 minutes until softened but still firm. Drain well and toss with a teaspoon of oil.
In a small bowl, combine soy sauce, oyster sauce, fish sauce, dark soy sauce, brown sugar, and rice vinegar. Stir until sugar dissolves. Set aside.
Arrange all prepped ingredients near the stove in order of use: oil, garlic and chilies, chicken, onion, bell pepper, vegetables, noodles, sauce, green onions, and basil.
Heat a wok or large skillet over highest heat for 2 minutes until smoking hot. Add oil and swirl to coat.
Add minced garlic and sliced chilies, stirring constantly for 10 seconds until fragrant. Add sliced onion and stir-fry for 1 minute.
Add chicken pieces in a single layer. Let sear for 30 seconds, then stir-fry for 2 to 3 minutes until cooked through and golden.
Add bell pepper, broccoli, and carrots, tossing for 2 minutes until tender-crisp.
Push everything to the sides of the wok. Add noodles to the center and pour sauce directly over them. Toss everything together for 1 to 2 minutes until noodles are evenly coated and heated through.
Add green onions and toss for 30 seconds. Remove from heat and add Thai basil leaves. Toss for 20 to 30 seconds until just wilted.
Serve immediately with lime wedges on the side.