Follow these instructions to make your delicious Hunan Chicken:

1. Prep the Chicken: Cut the chicken breasts into thin slices. Season lightly with salt and pepper.
2. Heat Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat.
3. Cook Chicken: Add the chicken to the pan in a single layer. Cook for about 5-7 minutes, stirring occasionally until fully cooked and lightly browned. Remove the chicken from the skillet and set aside.
4. Sauté Vegetables: In the same skillet, add the sliced bell peppers and onion. Sauté for about 3-4 minutes until they begin to soften.
5. Add Aromatics: Stir in the minced garlic and grated ginger, cooking for an additional minute until fragrant.
6. Create Sauce: In a small bowl, combine soy sauce, hoisin sauce, rice vinegar, and chili paste. Mix well.
7. Combine Chicken and Sauce: Return the chicken to the skillet, pouring the sauce over the mixture. Stir to combine, cooking for another 2-3 minutes.
8. Thicken Sauce: Pour in the cornstarch mixture, stirring continuously until the sauce thickens.
9. Serve: Remove from heat and serve hot over cooked rice or noodles.

These clear-cut steps will guide you in preparing this incredible dish with ease.