Preparing Chicken Chow Mein involves a few straightforward cooking steps. Follow this step-by-step guide to create this delicious meal:

1. Cook Noodles: Cook the chow mein noodles according to the package instructions. Drain and set aside.
2. Prepare Ingredients: Slice the chicken and vegetables as needed. Gather all ingredients to ensure an efficient cooking process.
3. Heat Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat.
4. Cook Chicken: Add the sliced chicken to the skillet and cook until browned, approximately 5-7 minutes. Remove from skillet and set aside.
5. Sauté Vegetables: In the same skillet, add minced garlic and the mixed vegetables. Stir-fry for about 3-4 minutes until vegetables are tender.
6. Combine Ingredients: Return the cooked chicken to the skillet with the vegetables. Stir to combine.
7. Add Sauce: Pour in the soy sauce, oyster sauce (if using), and sesame oil. Stir everything together for an additional 2-3 minutes.
8. Mix in Noodles: Add the cooked chow mein noodles to the skillet, tossing to combine with the chicken and vegetables. Cook for another 2-3 minutes.
9. Season to Taste: Adjust seasoning by adding salt and pepper as needed.
10. Garnish: Sprinkle sliced green onions and sesame seeds on top before serving.

And just like that, your mouthwatering Chicken Chow Mein is ready!