Start by cutting the chicken breast into bite-sized pieces for even cooking.
In a mixing bowl, combine the chicken pieces with sesame oil, salt, pepper, garlic powder, and sriracha. Mix well and let marinate for at least 30 minutes.
After marinating, sprinkle cornstarch over the chicken pieces and toss to coat evenly.
In a frying pan or deep fryer, heat oil over medium-high heat to submerge the chicken for even frying.
Carefully add the coated chicken pieces in batches and fry until golden brown and crispy, about 4-5 minutes per batch. Drain on paper towel.
In a separate bowl, mix together mayonnaise, sweet chili sauce, lime juice, and sriracha. Adjust sriracha to your heat preference.
In a large bowl, combine the crispy chicken bites with the Bang Bang sauce and toss gently to coat. Serve immediately.