Start by cutting your chicken breast or thighs into bite-sized cubes.
In a large mixing bowl, combine the cornstarch, Chinese five spice, salt, and ground black pepper. Add the cubed chicken to the bowl and toss until each piece is well-coated in the seasoned cornstarch mixture.
In a wok or large frying pan, heat the sesame oil over medium-high heat.
Carefully add the coated chicken pieces to the pan in a single layer. Cook for about 5-7 minutes, turning occasionally until the chicken is golden brown and crispy.
Add the diced green onions and chili peppers to the pan. Stir-fry for an additional 2-3 minutes.
Transfer the Salt and Pepper Chicken to a serving platter and garnish with any remaining diced green onions.