Combine first 6 ingredients, stirring well with a whisk; set aside.
Sprinkle fillets with salt and pepper. Dredge fillets lightly in flour, and coat both sides of fillets with cooking spray.
Heat oil in a large nonstick skillet over medium-high heat. Add fillets; cook 3 minutes. Reduce heat to medium; turn fillets, and cook 3 minutes or until fish flakes easily when tested with a fork. Remove from pan.
Add wine mixture to pan; cook 30 seconds, stirring constantly. Remove from heat; stir in butter until melted. Spoon wine mixture over fillets; sprinkle with parsley. Serve with lemon wedges, if desired.