Add chicken thighs to the bottom of the slow cooker in a single layer.
In a small bowl, whisk together soy sauce, honey, rice vinegar, garlic, and ginger. Pour the sauce over the chicken.
Cover and cook on low for 5–6 hours or on high for 3–4 hours until the chicken is tender.
Remove the chicken from the slow cooker and shred or slice as preferred. Set aside.
Mix cornstarch and water in a small bowl. Stir the slurry into the sauce in the slow cooker and cook on high for 10–15 minutes until thickened.
Return the chicken to the sauce and toss to coat. Serve with rice or noodles and garnish with green onions and sesame seeds.