In a bowl, mix mayonnaise, sweet chili sauce, and sriracha to make the bang bang sauce. Set aside.
Season chicken thighs with salt and pepper, then coat evenly with cornstarch.
Heat vegetable oil in a skillet over medium heat. Cook chicken thighs for 4-5 minutes on each side until golden and cooked through.
Remove chicken from the skillet and drizzle generously with bang bang sauce.
Serve immediately and enjoy!