In a large bowl, combine the diced chicken with 1/4 tsp salt and pepper. In a separate bowl, whisk together the egg whites. Dip each chicken piece first into the egg whites, then coat evenly with 1/4 cup cornstarch. Set aside on a plate ready for frying.
In a small bowl, whisk together 1/2 cup chicken broth (divided: keep some aside for later), honey, soy sauce, rice vinegar, and 1 tbsp cornstarch until smooth. Set this mixture aside – it will thicken into the glossy sauce once heated.
Heat 2 1/2 tsp toasted sesame oil in a large skillet or wok over medium heat. Add the minced garlic and ginger, sautéing for about 1-2 minutes until fragrant and golden but not burnt.
In a separate skillet, heat the extra-light olive or vegetable oil over medium-high heat. Add the coated chicken in batches, being careful not to overcrowd the pan. Fry until golden and crispy on all sides, about 5-6 minutes. Remove and drain on paper towels.
Add the sauce mixture to the skillet with the garlic and ginger. Cook over medium heat, stirring constantly, until the sauce thickens—about 2-3 minutes. If it gets too thick, add a splash of the reserved chicken broth to loosen it.
Return the fried chicken pieces to the skillet and toss well to coat evenly with the sauce. Warm through for another minute to marry the flavors.
Sprinkle toasted white sesame seeds and sliced green onions over the top. Serve immediately with steamed rice, stir-fried veggies, or wrapped in crisp lettuce leaves.