Begin the recipe by cutting the 1 pound chicken breasts into 1-inch bite size pieces and adding them to a large bowl.
Add the ½ teaspoon garlic powder, ¼ teaspoon salt, and ¼ teaspoon ground black pepper. Stir to coat the chicken in the seasonings. Add the 3 tablespoons cornstarch and gently toss the seasoned chicken to coat it fully. Set aside.
Using a large skillet on the stovetop over medium-high heat, add the 3 tablespoons oil and allow it to heat for a few minutes. Add the prepared chicken to the hot pan being careful not to crowd the pan. Allow the chicken to cook for 3-4 minutes.
Using a pair of tongs, flip each piece to the opposite side and allow it to continue cooking for another 3 minutes. The chicken should be golden brown and fully cooked at 165 degrees F.
Use the tongs to transfer the chicken to a plate, while you continue cooking the rest of the chicken using the same process.
Once done cooking all of the chicken pieces, add them back to the skillet and pour in the ⅓ cup teriyaki sauce.
Stir the sauce and chicken to combine. Allow it to heat for about 2 to 3 minutes, the sauce will thicken as it cooks.
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Notes
Make homemade sauce using soy sauce, water, mirin, brown sugar, honey, garlic, and ginger.
Try making a teriyaki chicken bowl by serving it over white rice, or brown rice, and adding your favorite vegetables.
Marinate the chicken in some additional teriyaki sauce for at least 30 minutes before tossing it in cornstarch. This will add more savory sauce flavor to the chicken.
Try to cut the chicken into even size pieces to ensure the chicken cooks evenly.
For a more spicy flavor, add some red pepper flakes along with the sauce.
Do not overcook the chicken or it will dry out and try not to crown the pan while cooking.