Prepare the teriyaki sauce by whisking soy sauce, mirin, sake, brown sugar, honey, ginger, garlic, and sesame oil.
Cook rice according to package instructions and keep warm.
Sauté vegetables in a skillet or wok until crisp-tender, then set aside.
Cook chicken pieces until browned and cooked through (165°F internal temperature).
Add teriyaki sauce to chicken, simmer 2–3 minutes.
Stir in cornstarch slurry, cook until sauce thickens and turns glossy.
Return vegetables to skillet, toss to coat.
Assemble bowls with rice, chicken, and vegetables.
Garnish with sesame seeds and green onions, serve immediately.