01 - In a mixing bowl, combine buttermilk, garlic powder, paprika, salt, and black pepper. Add chicken breast pieces and coat evenly. Cover and place in the refrigerator for at least 30 minutes to tenderize.
02 - In a separate bowl, whisk together all-purpose flour, corn starch, paprika, onion powder, cayenne pepper if using, salt, and black pepper until fully combined.
03 - Pour vegetable oil into a deep frying pan or heavy pot to a depth of at least 1.5 inches. Heat to 350°F (175°C), monitoring the temperature with a thermometer.
04 - Remove marinated chicken pieces from the bowl, allowing excess marinade to drip off. Dredge each piece thoroughly in the seasoned flour mixture, pressing to adhere.
05 - Fry the coated chicken bites in batches, placing them gently into the hot oil using a slotted spoon. Cook for 3 to 4 minutes per batch until exterior is golden brown and internal temperature reaches 165°F (74°C). Transfer to a paper towel-lined plate to drain.
06 - Serve immediately with preferred dipping sauces such as ranch, honey mustard, or barbecue sauce.