Cook the rice: Make rice according to package directions. For meal prep, cook extra and let it cool on a sheet pan to prevent clumping.
Mix the teriyaki sauce: In a small bowl, whisk soy sauce, water, honey, rice vinegar, sesame oil, garlic, and ginger.
In a separate cup, stir the cornstarch with water to make the slurry. Set both aside.
Prep the chicken and veggies: Pat chicken dry and season with salt and pepper. Chop broccoli, slice bell pepper, shred carrots, and slice green onions.
Sear the chicken: Heat oil in a large skillet over medium-high.
Add chicken in a single layer. Cook 5–7 minutes, stirring occasionally, until golden and cooked through.
Steam or sauté the veggies: Push chicken to one side. Add broccoli and bell pepper to the empty side with a splash of water.
Cover for 2–3 minutes to steam, then uncover and sauté until crisp-tender. Stir in the carrots.
Add the sauce: Pour the teriyaki sauce (not the slurry yet) into the pan and bring to a gentle simmer.
Thicken: Stir the cornstarch slurry, then pour it in while stirring the pan. Simmer 1–2 minutes until the sauce turns glossy and coats the chicken and veggies.
Taste and adjust: Add a pinch of salt, extra honey, or a splash of rice vinegar if needed.
Remove from heat.
Assemble the bowls: Spoon rice into bowls, top with teriyaki chicken and veggies, then garnish with green onions and sesame seeds.