In a small bowl, combine honey, olive oil, soy sauce, vinegar, and Sriracha. Stir well to combine.
Place chicken thighs in a container with a lid and pour honey sriracha marinade over the chicken.
Cover and refrigerate for at least 30 minutes, up to overnight.
Preheat the grill to medium-high heat.
Place chicken thighs on grill and grill 8-10 minutes on each side, with the lid closed, or until meat thermometer reads 180 degrees.
Serve drizzled with more Sriracha, if desired, and topped with green onions.