Lightly season both sides of chicken with salt and pepper, put into crock pot.
In a medium bowl, combine honey, soy sauce, onion, ketchup, oil, garlic and pepper flakes.
Pour over chicken.
Cook on low for 4 hours.
Remove chicken from crock pot, leave sauce.
Dissolve 4 teaspoons of cornstarch in 6 tablespoons of water and pour into crock pot.
Stir to combine with sauce.
Replace lid and cook sauce on high for 10 minutes, or until slightly thickened.
Shred chicken into bite size pieces. In individual bowls, place chicken pieces over cooked rice and spoon some sauce on top.
Sprinkle with sesame seeds and chopped scallions.