Cook your base: Prepare rice or quinoa according to package directions. Fluff and keep warm.
Whisk the sauce: In a bowl, mix soy sauce, 1/3 cup water, honey, rice vinegar, sesame oil, and red pepper flakes.
In a separate small cup, stir cornstarch with 1 tablespoon cold water until smooth. Set both aside.
Season the chicken: Pat chicken dry and season with a light pinch of salt and black pepper. Don’t over-salt—soy sauce adds plenty.
Sear the chicken: Heat 1 tablespoon oil in a large skillet over medium-high.
Add chicken in an even layer. Cook 5–7 minutes, stirring occasionally, until browned and cooked through. Transfer to a plate.
Sauté the veggies: Add remaining 1 tablespoon oil to the skillet.
Toss in bell pepper, broccoli, carrot, and zucchini. Cook 4–5 minutes until crisp-tender. Add garlic and ginger; cook 30 seconds until fragrant.
Combine and sauce: Return chicken to the skillet.
Pour in the soy mixture and bring to a gentle simmer. Stir in the cornstarch slurry and cook 1–2 minutes, stirring, until the sauce thickens and coats everything.
Taste and adjust: Add a splash of water if too thick or a touch more honey if you prefer sweeter. Balance with a squeeze of lime if you like brightness.
Assemble bowls: Divide rice among bowls.
Top with the teriyaki chicken and veggies. Garnish with green onions and sesame seeds. Serve hot.