Creating Chicken & Vegetable Stir-Fry is a simple process when you follow these steps:

1. Prepare Your Ingredients: Gather and slice all your ingredients: chicken, vegetables, garlic, and ginger.
2. Heat the Pan: In a large skillet or wok, heat the vegetable oil over medium-high heat until it shimmers.
3. Cook the Chicken: Add sliced chicken to the pan. Stir-fry until it turns golden brown and is cooked through, about 5-7 minutes.
4. Add Aromatics: Once cooked, add the minced garlic and ginger to the pan. Stir constantly for about 30 seconds until fragrant.
5. Add Vegetables: Toss the mixed vegetables into the pan. Stir-fry for another 3-5 minutes until they become bright and tender-crisp.
6. Sauce It Up: Pour in the soy sauce and oyster sauce (if using). Mix well to coat the chicken and vegetables evenly.
7. Thicken the Sauce: Add the cornstarch mixture to the pan, stirring rapidly. Cook for about 1-2 minutes until the sauce thickens slightly.
8. Season: Taste the stir-fry and season with salt and pepper to taste.
9. Garnish: Once done, remove from heat and sprinkle with chopped green onions and sesame seeds.
10. Serve: Transfer to a serving dish while hot!

These steps will guide you beautifully in creating a satisfying Chicken & Vegetable Stir-Fry full of flavor and crunch.