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Place chicken breasts in the slow cooker.
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In a small bowl, whisk together honey, soy sauce, ketchup, olive oil, onion, garlic, and red pepper flakes. Pour over chicken breasts. Cook on low for 3-4 hours, or on high for 2 1/2 - 3 1/2 hours.
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When chicken is cooked through and tender, transfer chicken breasts to a plate.
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Whisk cornstarch into the sauce and continue cooking for another 5-10 minutes, for sauce to thicken.
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While sauce continues to cook, use to forks or a set of bear claws to shred chicken. Return chicken to slow cooker and stir to coat chicken in sauce.
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Sprinkle with sesame seeds and serve over rice.