Combine first 9 ingredients in a large zip-top plastic bag; seal and shake well. Add chicken; seal and toss to coat. Refrigerate at least 2 hours or overnight, turning occasionally.
Preheat oven to 425°.
Remove chicken from bag, reserving marinade. Arrange chicken in a single layer on the rack of a broiler pan coated with cooking spray. Sprinkle chicken with salt and pepper. Bake at 425° for 20 minutes, stirring once.
While chicken is cooking, strain marinade through a sieve into a bowl; discard solids. Place marinade in a saucepan; bring to a boil. Cook 3 minutes; skim solids from surface. Combine cornstarch and water in a small bowl; stir with a whisk. Add cornstarch mixture to pan, stirring with a whisk; cook 1 minute. Remove from heat; pour glaze into a large bowl.
Add chicken to glaze; toss well to coat. Place chicken mixture on a jelly roll pan; broil 5 minutes or until browned, stirring twice. Sprinkle with sesame seeds, if desired.