In a small bowl, combine honey, water, soy sauce, rice vinegar, and cornstarch; whisk thoroughly until smooth and the cornstarch is mixed in well.
Pat the chicken thighs dry with paper towels and cut into 1-inch pieces, then sprinkle with half of the kosher salt.
Heat one tablespoon of oil in a large skillet over medium-high heat until hot and shimmering, then add the chicken in a single layer; cook, turning occasionally, until golden brown on all sides, about 8 to 10 minutes. Remove the chicken to a bowl.
Add the remaining oil to the skillet, then spread the zucchini pieces evenly in the pan; sprinkle with the rest of the kosher salt and let cook undisturbed for about one minute to develop a light brown color, then toss and cook for an additional minute.
Stir in the minced garlic and the white ends of the scallions, cooking for about 30 seconds until fragrant.
Return the chicken along with any juices back to the skillet, give the sauce a quick stir and pour it into the pan; cook while stirring often until the sauce thickens and the chicken finishes cooking, about 1 to 2 minutes.
Garnish with the green parts of the scallions and serve immediately.