In a large bowl, combine sugar, soy sauce, sesame oil, rice wine, ginger, olive oil, and garlic. Add the chicken and nicely coat with the marinade. Cover and marinate for 1 hour in the fridge.
Preheat cast iron skillet to medium high heat ( you can also grill if you prefer). Add the vegetable oil. Cook the chicken about 2 to 3 minutes each side or until chicken looks done.
Garnish with sesame seeds.
Recipe by The Gluten Free at https://www.theglutenfree.com/teriyaki-chicken-breast/