In a medium bowl, mix sweet chili sauce, mayonnaise, and sriracha to make the Bang Bang sauce.
Add the shredded chicken to the sauce and stir until evenly coated.
Toast the slider buns lightly, if desired.
Place a scoop of the Bang Bang chicken mixture onto each bottom bun.
Top with coleslaw mix, green onions, and sesame seeds if using.
Cover with the top bun and serve immediately.