Creating Chinese Chicken with Garlic Sauce is straightforward if you follow these simple steps:

1. Prepare Chicken: Cut the boneless chicken breasts into bite-sized pieces and set aside.
2. Make Sauce: In a small bowl, whisk together soy sauce, chicken broth, cornstarch, sugar, rice vinegar, and red pepper flakes (if using). Set aside.
3. Heat Oil: In a large skillet or wok, heat vegetable oil over medium-high heat.
4. Cook Chicken: Add the chicken pieces to the skillet and cook for 5-7 minutes, or until golden brown and cooked through.
5. Add Garlic and Ginger: Stir in the minced garlic and ginger, cooking for an additional 1-2 minutes until fragrant.
6. Add Vegetables: Toss in broccoli florets and sliced bell pepper, cooking for another 3-4 minutes, or until the vegetables are tender-crisp.
7. Combine Sauce and Chicken: Pour the prepared sauce over the chicken and vegetables, stirring to coat everything evenly.
8. Thicken Sauce: Allow the sauce to cook for 1-2 minutes until it thickens and clings to the chicken and vegetables.
9. Garnish: Remove from heat and garnish with chopped green onions.
10. Serve: Transfer to a serving platter and enjoy your delicious Chinese Chicken with Garlic Sauce!