Start by cutting your chicken into bite-sized pieces. Using chicken thighs adds a bit more juiciness and flavor, but chicken breasts work well too. Pat the chicken dry with paper towels to help it brown nicely when cooked.
In a small bowl, whisk together the honey, soy sauce, rice vinegar, minced garlic, grated ginger, and black pepper. This mixture will be the heart of your sauce, combining sweet, tangy, and savory notes.
Heat the vegetable oil in a large skillet or wok over medium-high heat. Once hot, add the chicken pieces in a single layer. Cook them for about 5-7 minutes, turning occasionally, until they are golden brown and cooked through. Remove the chicken from the pan and set aside.
In the same pan, reduce the heat to medium. Pour in the honey garlic sauce mixture and bring it to a gentle simmer. In a small bowl, mix the cornstarch with water to create a slurry. Slowly stir the slurry into the sauce, whisking continuously to avoid lumps. Cook until the sauce thickens and becomes glossy, about 2-3 minutes.
Return the cooked chicken pieces to the pan and toss them in the thickened sauce, ensuring every piece is coated evenly. Cook for another 2 minutes to let the chicken soak up the flavors and get sticky.
Transfer the chicken to a serving dish, sprinkle with toasted sesame seeds and chopped green onions for an extra pop of flavor and texture. Serve hot over steamed jasmine rice, brown rice, or alongside stir-fried vegetables for a complete meal.