Cut chicken into bite-size chunks. Stir together the egg whites and the corn starch and mix in the chicken pieces.
Mix together the bread crumbs with the salt and sesame in another bowl
Dredge the chicken pieces in the crumbs to coat well and arrange so they are not touching on a nonstick baking sheet, sprayed with cooking spray.
Bake 350 degree oven until browned, about 20 minutes.
Heat the oil in a large skillet over medium high heat and stir in garlic and onion. Stir fry until brown, reduce heat and stir in soy sauce, marmalade and vinegar. Stir until mixture begins to bubble and simmer.
Stir in chicken to glaze pieces well but be gentle so crust stays on chicken.
Arrange chicken over bed of sprouts arranged on serving platter. Sprinkle with scallions.