Cut the chicken thighs into bite-sized pieces.
Mix cornstarch with a pinch of salt and pepper in a bowl.
Dip each chicken piece into the cornstarch mixture, coating well.
Dip the coated chicken into the beaten egg, allowing excess to drip off.
Roll the chicken in panko breadcrumbs until fully covered.
Heat oil in a skillet over medium-high heat for frying.
Add the chicken pieces in batches and fry until golden brown.
Remove chicken and drain on paper towels.
Mix mayonnaise, sweet chili sauce, Sriracha, and garlic powder in a bowl.
Toss the fried chicken in the sauce until evenly coated.
Serve hot, garnished with fresh cilantro.