Place diced chicken into zip-top plastic bag. Add buttermilk, salt, pepper, and hot sauce (if using). Seal bag and massage to coat all the chicken in buttermilk mixture. Set aside while you prepare other ingredients.
Preheat oven to 425 degrees F, and line a baking sheet with parchment paper sprayed lightly with cooking spray.
Gather 3 bowls; spoon flour and salt and pepper in one bowl (toss to combine), eggs and 1 1/2 tbsp jerk sauce in one bowl (beat together lightly), and panko breadcrumbs, dried parsley, paprika, garlic powder, salt and pepper in the last bowl (toss to combine). Line up bowls so that the order goes flour, eggs, panko, then have prepared baking sheet at the end.
Using one hand for wet ingredients and another hand for dry ingredients, transfer chicken from buttermilk mixture (a couple pieces at a time), shaking excess buttermilk from chicken, to the flour bowl. Coat chicken in flour, then transfer to the egg bowl. Turn chicken in egg mixture, then transfer chicken to the panko bowl. Toss chicken in panko mixture until well coated, then transfer to prepared baking sheet.
Repeat with remaining chicken pieces, leaving about 1/2 inch between chicken pieces on the baking sheet to allow for even cooking.
Bake chicken for 15 minutes, or until cooked through, turning over halfway through. If desired, broil chicken for a minute to get them even crispier.
Serve chicken with Caribbean Jerk sauce on the side for dipping, or add chicken to a large bowl, top with sauce and toss to coat chicken in the sauce.