Preheat the oven to 375 degrees. Line a baking sheet with foil then place two (oven-safe) cooling racks on the baking sheet. Side Note: This will help the chicken "air bake" meaning the thighs cook evenly and will allow the chicken to be crispy on all sides.
Pour the buttermilk into a dish.
In another dish, combine the panko, paprika, garlic powder, onion powder, sea salt, and freshly cracked pepper, to taste; mix until well combined.
Dip the chicken into the buttermilk then dip into the panko crumb mixture until evenly coated.
Place the coated chicken onto the rack-lined baking sheet; repeat with the remaining chicken thighs.
Season the top of the crusted chicken thighs with a little more sea salt and freshly cracked pepper, to taste, then spray with cooking spray.
Place into the oven and bake for 25-30 minutes or until 170 degrees on a meat thermometer, and the juices are clear.
Remove from the oven and let the chicken rest for 5 minutes before serving. Enjoy.