Start by cutting the boneless chicken into bite-sized pieces for even cooking.
In a bowl, combine the dark soy sauce, honey, and minced garlic. Add the chicken pieces, ensuring they’re well coated. Let marinate for at least 30 minutes.
Heat the sesame oil in your skillet over medium-high heat. Add the marinated chicken, reserving the marinade. Stir-fry until cooked through and golden, about 5-7 minutes.
Once the chicken is nearly done, toss in the sliced bell peppers. Stir-fry for an additional 3-4 minutes until the peppers are slightly tender but still crisp.
Mix the cornstarch with a few tablespoons of water to create a slurry. Pour the reserved marinade into the skillet, add the cornstarch slurry, and stir well. Cook for another 2-3 minutes until the sauce thickens.
Sprinkle with chopped scallions and sesame seeds. Serve hot over rice or noodles.