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