01 - Place chicken breasts in a large resealable bag or shallow dish. Pour dill pickle juice over the chicken, add fresh dill if using, and marinate in the refrigerator for at least 1 hour, up to 4 hours for enhanced flavor.
02 - Preheat oven to 425°F if baking, or heat vegetable oil in a large skillet over medium-high heat if frying.
03 - In a shallow bowl, whisk together eggs and milk until fully combined.
04 - In another bowl, combine Parmesan, panko breadcrumbs, garlic powder, onion powder, paprika, black pepper, and salt. Mix thoroughly.
05 - Remove chicken from marinade and pat dry thoroughly with paper towels.
06 - Dip each chicken breast into the egg mixture, then dredge thoroughly in the Parmesan-panko mixture, pressing firmly to adhere the coating.
07 - For baking: Place breaded chicken on a parchment-lined baking sheet. Spray generously with olive oil spray. Bake for 20-25 minutes, flipping halfway through, until golden brown and internal temperature reaches 165°F. For frying: Cook chicken in hot oil for 4-5 minutes per side until deeply golden and internal temperature reaches 165°F. Drain on paper towels.
08 - Let chicken rest for 5 minutes before serving. Serve with additional dill pickles or creamy ranch dip if desired.