Cook your base: Prepare rice, quinoa, or cauliflower rice according to package directions.
Fluff and keep warm.
Mix the sauce: In a small bowl, whisk tamari/soy sauce, maple syrup, rice vinegar, sesame oil, garlic, ginger, water, and cornstarch until smooth. Set aside.
Prep the chicken: Pat the chicken dry and season lightly with salt and pepper. This helps with browning and flavor.
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. Transfer to a plate.
Sauté the veggies: In the same pan, add a splash more oil if needed.
Add carrots and broccoli first; cook 2–3 minutes. Add bell pepper and snap peas; cook another 2–3 minutes until crisp-tender.
Thicken the sauce: Whisk the sauce again (the starch settles). Pour it into the pan with the veggies.
Stir constantly over medium heat until glossy and thick, about 1–2 minutes.
Combine: Return chicken and any juices to the pan. Toss to coat everything in the sauce. If you want heat, add sriracha or red pepper flakes now.
Taste and adjust sweetness or salt as needed.
Assemble bowls: Spoon rice into bowls. Top with teriyaki chicken and veggies. Garnish with green onions, sesame seeds, and a squeeze of citrus if you like.