Place egg whites in a shallow bowl. In a another bowl, combine panko breadcrumbs, paprika, onion powder, and garlic powder.
Sprinkle cod fillets with pepper and salt. Dip each fillet in egg white, then press into panko mixture to coat evenly. Place on a broiler pan coated with cooking spray. Broil 4 minutes on each side or until flaky.
To prepare the lemon dill sauce; Combine mayo, pickle, lemon juice, and dill. Serve with fish and lemon wedges.