Creating Mushroom Chicken is straightforward. Follow these simple steps for delicious results:

1. Prep Ingredients: Gather and slice all your vegetables and chicken, ensuring they are ready for cooking.
2. Heat Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat.
3. Cook Chicken: Add the sliced chicken to the skillet and cook until it is golden brown and cooked through, approximately 5-7 minutes. Remove the chicken from the skillet and set aside.
4. Sauté Aromatics: In the same skillet, add minced garlic and ginger. Sauté for about 1 minute until fragrant.
5. Add Vegetables: Stir in the sliced onions, bell peppers, and broccoli. Cook for about 3-4 minutes, or until the vegetables are tender-crisp.
6. Incorporate Mushrooms: Add the sliced mushrooms to the skillet and continue cooking for another 3 minutes until they are soft.
7. Combine Sauces: In a small bowl, mix the soy sauce, oyster sauce, cornstarch, and chicken broth together to create a sauce.
8. Combine Everything: Return the cooked chicken to the skillet and pour the sauce over the mixture. Stir well to coat everything evenly.
9. Simmer: Reduce the heat to low and let the mixture simmer for about 2-3 minutes, allowing the sauce to thicken.
10. Season to Taste: Add salt and pepper according to your preference.
11. Garnish: Serve hot, garnished with sliced green onions and a sprinkle of sesame seeds.

These steps will guide you in creating a fantastic Mushroom Chicken dish that will surely impress!