Pat dry chicken thighs with paper towels and arrange on the prepared baking sheet. Set aside.
In a small mixing bowl, combine olive oil, soy sauce, apple cider vinegar, light brown sugar, ketchup, Worcestershire sauce, sriracha, and garlic; whisk until well combined.
Brush 2/3 of the sauce over the chicken thighs.
Broil the chicken thighs for 5 minutes.
Remove from oven and brush on the remaining sauce.
Continue to broil for 5 to 7 more minutes or until the chicken's internal temperature registers at 165°F. The cooking time will depend on the size of the chicken thighs.
Remove the chicken from the oven and let it rest for 5 minutes.
Garnish with parsley and serve.
Notes
This recipe is for boneless, skinless chicken thighs. NOT bone-in and skin-on. If the skin is on, it will begin to smoke.
You do not need to flip the chicken after the initial broil, but you can if you want to.