Cook the ramen noodles in boiling water for 2 minutes, then drain and set aside.
Heat vegetable oil in a large skillet or wok over medium‑high heat.
Add sliced chicken, season with salt and pepper, and cook until golden brown.
Stir in garlic, bell pepper, broccoli, and carrots. Cook until vegetables are tender‑crisp.
Add soy sauce, oyster sauce, and sesame oil. Toss to coat the chicken and vegetables.
Add cooked noodles to the skillet and stir until everything is well combined.
Top with sliced green onions before serving.