Make the marinade by combining the ingredients in a large zip-lock bag, seal, and shake well. Add the chicken breasts and toss to coat evenly.
Place in the refrigerator for at least 2 hours, turning occasionally.
Remove chicken from the bag, reserving marinade. Season with sea salt and freshly cracked pepper, to taste.
Heat a large skillet coated with cooking spray over medium heat. Place the chicken breasts in the skillet, cook for 7-8 minutes, then flip. (I wiped out the pan with a paper towel when I flipped them so the chicken wouldn't burn from the sugar in the marinade.)
Cook for another 4-5 minutes or until the chicken is cooked and the juices run clear.
While the chicken is cooking, strain the marinade through a sieve and discard the solids.
Place the marinade in a small saucepan over high heat; bring to a boil. Cook for 3-5 minutes.
Combine the cornstarch and cold water in a small bowl; stir with a whisk.
Add the cornstarch mixture to the same skillet or small saucepan, stirring with a whisk, and cook for 1 minute. Remove from heat.
Let the chicken rest for 5 minutes; slice the breasts into thin strips, then drizzle with sauce.
Sprinkle the top with sesame seeds and green onions.