Place the chicken breasts in the slow cooker.
In a medium bowl, whisk together honey, soy sauce, ketchup, vegetable oil, garlic, red pepper flakes, salt, and pepper.
Pour the honey mixture over the chicken.
Cover and cook on low for 6–7 hours or on high for 3–4 hours, until the chicken is tender and cooked through.
Remove the chicken from the slow cooker and set aside.
Pour the sauce into a saucepan and bring to a simmer over medium heat.
Reduce slightly to thicken, about 5–10 minutes.
Serve the chicken with the thickened sauce drizzled over the top.
Serving & Storage Tips
