Toss Chicken with Cornstarch: Pat the cubed chicken breast completely dry with paper towels. In a mixing bowl, toss chicken pieces with 2 tablespoons cornstarch, 1/2 teaspoon garlic powder, 1/2 teaspoon sea salt, and 1/4 teaspoon black pepper until evenly coated.
Whisk Honey Garlic Glaze: In a small measuring cup or bowl, whisk together the honey, tamari soy sauce, chicken broth, apple cider vinegar, minced garlic, grated ginger, and red pepper flakes until smooth.
Sear Chicken Bites to Crisp Perfection: Heat 2 tablespoons cooking oil in a large 12-inch skillet over medium-high heat. Add chicken pieces in a single layer without crowding. Sear undisturbed for 3 to 4 minutes until golden-crisp on the bottom, then flip and cook for another 2 to 3 minutes until cooked through. Transfer to a plate.
Simmer Honey Garlic Sauce: Lower heat to medium. Pour the whisked honey garlic sauce into the skillet. Bring to a rapid simmer for 1 to 2 minutes, stirring as it bubbles, caramelizes, and thickens into a glossy glaze.
Toss, Garnish & Serve: Return the cooked crispy chicken bites to the skillet. Toss continuously for 60 seconds until every bite is thoroughly glazed. Drizzle with toasted sesame oil and remove from heat. Garnish with toasted sesame seeds and fresh green scallions. Serve hot over steamed rice!