Marinate the chicken by combining soy sauce, honey or maple syrup, rice vinegar, garlic powder, ginger powder, salt, and pepper. Let it marinate for at least 30 minutes.
Cook the marinated chicken in a skillet over medium-high heat for about 5-7 minutes on each side until golden brown and cooked through.
Prepare the sauce by adding the remaining marinade to the skillet, bringing it to a gentle boil, and thickening it with a cornstarch slurry.
Assemble the bowl with cooked rice or quinoa, sliced chicken, mixed vegetables, and drizzle with sauce. Garnish with green onions and sesame seeds.