Pat the chicken breasts dry with paper towels. Pound them to an even thickness if needed.
Season both sides with garlic powder, onion powder, ground ginger, salt, and black pepper.
In a small bowl, whisk together the soy sauce, honey, brown sugar, water, rice vinegar, and sesame oil.
Heat the olive oil in a large skillet over medium-high heat.
Cook the chicken for 5 to 6 minutes per side until golden brown.
Reduce the heat to medium. Add the minced garlic and cook for 30 seconds until fragrant.
Pour the teriyaki sauce into the skillet and bring it to a gentle simmer.
Stir in the cornstarch slurry and cook for 1 to 2 minutes, stirring until the sauce thickens into a glossy glaze.
Spoon the sauce over the chicken, turning it once to coat both sides. Cook until the internal temperature reaches 165°F (74°C).
Remove the chicken from the skillet and let it rest for 5 minutes.
Slice the chicken, drizzle with the remaining teriyaki sauce, and garnish with sesame seeds and green onions before serving.