Cook the rice. Rinse your rice until the water runs clear.
Cook according to package directions. Fluff and set aside. For extra flavor, add a pinch of salt or a splash of rice vinegar while it steams.
Make the teriyaki sauce base. In a saucepan, combine soy sauce, water, honey or brown sugar, rice vinegar, ginger, garlic, sesame oil, and optional sriracha.
Bring to a gentle simmer over medium heat, stirring to dissolve the sweetener.
Thicken the sauce. Stir the cornstarch slurry to recombine, then pour it into the simmering sauce while whisking. Cook 1–2 minutes until glossy and thick enough to coat a spoon. Remove from heat.
Taste and adjust sweetness or saltiness as needed.
Prep the vegetables. While the sauce heats, chop broccoli, carrots, bell pepper, and snap peas. Keep pieces bite-size for quick cooking and easy eating.
Steam or sauté the vegetables. Steam until crisp-tender (bright in color and just fork-prickable), about 3–5 minutes. Or sauté in a little oil over medium-high heat for light char.
Season with a pinch of salt. Set aside.
Sear the chicken. Pat the chicken dry and season lightly with salt and pepper. Heat oil in a large skillet over medium-high.
Add chicken in a single layer and cook, undisturbed, 3–4 minutes to get nice color, then flip and cook another 3–4 minutes until just cooked through.
Sauce the chicken. Pour about half of the teriyaki sauce into the skillet with the chicken. Toss and simmer 1–2 minutes until the chicken is glossy and fully coated. Reserve the remaining sauce for drizzling during assembly.
Assemble the bowls. Divide rice among meal prep containers.
Top with equal portions of chicken and vegetables. Spoon extra sauce over each bowl for moisture and flavor.
Garnish. Add sliced green onions and a sprinkle of sesame seeds. Let bowls cool uncovered for 15–20 minutes before sealing to prevent condensation.
Seal and store. Once cooled, close containers and refrigerate.