Cut the fat out from the chicken thighs and chop it to bite size pieces.
Boil 2 cups of water and place the chicken thighs in it. Let the chicken boil for 5 minutes.
Drain the chicken and save the chicken broth, this is going to be your chicken stock.
Combine chicken stock, soy sauce, and sugar and bring it to a boil. This is the teriyaki sauce base.
Combine potato starch and 1 tbsp of water to create a starch slurry and add to the teriyaki base. Bring the sauce to a boil until it becomes thick. Turn off the heat.
In a separate pan, saute the chicken with garlic and pan-fry it until the chicken is nicely light brown.
Add the vegetables and saute them again until nicely lightly brown.
Pour in the sauce until everything is covered.
Taste and adjust with more sauce as needed.
Plate and serve with freshly cooked rice. Enjoy!