Place fillets in a single layer on a greased, shallow oven-to-table type broiler pan; brush with lemon juice.
Combine next 6 ingredients in a small bowl and set aside.
Broil fillets 4 to 6 minutes or until fish flakes easily when tested with a fork.
Remove from oven; spread with cheese mixture. Broil an additional 3 seconds or until cheese is lightly browned and bubbly.
Garnish with lemon twists and parsley if desired.