Trim excess fat from chicken and cut into 1-inch pieces.
In a large bowl, combine cornstarch and flour with a pinch of salt. Toss chicken pieces in the coating until evenly coated.
Heat 1-2 tablespoons oil in a large skillet over medium-high heat. Fry coated chicken in batches until golden and cooked through; drain on paper towels.
In a small bowl, whisk together soy sauce, honey, sweet chili sauce, rice vinegar, sesame oil, minced garlic, and grated ginger to make the sauce.
In the same skillet, add sliced bell pepper and broccoli; sauté 2-3 minutes until crisp-tender. Pour in the sauce; simmer 1-2 minutes until slightly thickened.
Return chicken to the pan and toss to coat with the sauce. Cook 1 minute to combine flavors. Serve hot over steamed rice; garnish with sesame seeds if desired.
Notes
Best served immediately with steamed jasmine rice.