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Cook the chow mein noodles according to package instructions. Drain and set aside.
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Heat the vegetable oil in a wok or large frying pan over high heat. Add the sliced chicken and stir-fry until browned and cooked through, about 5 minutes. Remove the chicken from the pan and set aside.
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Add the sliced onion, minced garlic, red bell pepper, and sliced mushrooms to the same pan. Stir-fry for 2-3 minutes until the vegetables are slightly softened.
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Add the shredded cabbage to the pan and stir-fry for another 2-3 minutes until wilted.
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Mix the soy sauce, oyster sauce, sugar, and sesame oil in a small bowl.
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Add the cooked chow mein noodles and the sauce to the pan with the vegetables. Stir-fry everything together for 2-3 minutes until the noodles are coated in the sauce and heated through.
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Return the cooked chicken to the pan and stir-fry for another 1-2 minutes until everything is well combined.
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Serve the chow mein hot, garnished with chopped green onions.