Stir together first 4 ingredients; reserve half of mixture.
Cut chicken in half, and sprinkle evenly with salt and pepper. Place chicken in a large freezer bag, and pour half of teriyaki mixture over chicken; seal bag, and chill 8 hours, turning chicken, if desired.
Remove chicken from marinade, discarding marinade. Place chicken, skin side up, on an aluminum foil-lined 15- x 10-inch jellyroll pan.
Bake at 450° for 45 minutes or until a meat thermometer inserted into chicken thigh registers 180°. Brush with reserved teriyaki mixture.
This was very tasty. Very quick and simple to make and I will certainly make it again. I also added 3 tablespoons of water and will next time omit the oil.