Step 1: Season the chicken breasts lightly with salt and black pepper on both sides.
Step 2: Heat vegetable oil in a skillet over medium heat. Add the chicken and cook for 5–6 minutes per side until fully cooked and lightly browned. Remove from the pan and set aside.
Step 3: In the same skillet, add soy sauce, honey, rice vinegar, sesame oil, and grated ginger. Stir and bring to a gentle simmer.
Step 4: Add the cornstarch slurry to the sauce and cook for 1–2 minutes, stirring constantly, until the sauce thickens.
Step 5: Slice the cooked chicken and return it to the pan, tossing to coat evenly in the teriyaki sauce. Remove from heat.
Step 6: Divide the cooked rice among serving bowls. Arrange carrots, cucumber, and bell pepper on top.
Step 7: Add the teriyaki chicken over the rice and vegetables. Garnish with green onions and sesame seeds.