Place the chicken thighs in the slow cooker and season them with salt and black pepper.
In a small bowl, stir together the honey, minced garlic, soy sauce, and rice vinegar until smooth.
Pour the honey garlic mixture over the chicken thighs, turning the pieces so they are evenly coated.
Cover and cook on low for 5 to 6 hours or on high for 3 hours until the chicken is tender.
About 20 minutes before the chicken is done, combine the rice and water in a medium pot. Bring to a boil, then reduce heat to low, cover, and simmer for 15 minutes until the rice is fluffy.
Serve the chicken thighs and sauce over the steamed rice and top with sliced green onions.