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Whisk together teriyaki marinade ingredients until sugar dissolves.
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Add chicken to the marinade, toss to coat, and let sit 15 minutes.
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Heat oil in a skillet over medium-high heat; cook chicken until no longer pink, about 5 minutes.
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Pour in reserved marinade, bring to a simmer, and cook until sauce thickens and coats the chicken, about 5 minutes.
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Divide cooked rice among bowls, top with teriyaki chicken and sauce, then garnish before serving.