In a bowl, combine soy sauce, sweetener (or reduced honey), chili flakes, minced garlic, and grated ginger. Mix well.
Add the chicken pieces to the marinade and toss to coat evenly. Let it marinate for at least 30 minutes, or overnight for more flavor.
Cook the Chicken:
Heat a pan over medium-high heat and spray it with cooking spray.
Add the marinated chicken pieces, reserving the leftover marinade. Cook the chicken until it’s golden brown and cooked through, about 6-8 minutes.
Add Vegetables:
Add the sliced onion and red bell pepper to the pan. Stir-fry with the chicken until the vegetables are just tender, about 3-4 minutes.
Add Remaining Marinade:
Pour the remaining marinade into the pan and stir well to coat the chicken and vegetables. Cook for another 2-3 minutes until the sauce has thickened slightly.
Serve:
Season with salt and pepper to taste. Garnish with sesame seeds and sliced green onions.
