In a bowl, combine the chicken pieces with cornstarch, salt, and black pepper. Toss until the chicken is evenly coated.
Heat vegetable oil in a large skillet or wok over medium-high heat. Add the coated chicken and cook for about 5-7 minutes, or until golden brown and crispy. Remove the chicken from the skillet and set aside.
In the same skillet, add the bell peppers, broccoli, and snap peas. Stir-fry for about 3-4 minutes until the vegetables are tender-crisp.
Add the minced garlic and ginger to the skillet, stirring for another minute until fragrant.
In a small bowl, whisk together the soy sauce, honey, rice vinegar, and sesame oil. Pour the sauce over the vegetables and stir to combine.
Return the crispy chicken to the skillet and toss everything together until well coated in the sauce. Cook for an additional 2-3 minutes to heat through.
If desired, sprinkle with sesame seeds before serving. Serve hot over cooked rice or noodles.