Combine first 5 ingredients and set aside. Place fish on lightly greased broiler pan rack. Drizzle lemon juice over fillets; sprinkle with pepper. Broil 6 inches from heat 8 to 10 minutes or until fish flakes when tested with a fork.
Remove from oven; spread tops of fillets with cheese mixture. Broil an additional 2 minutes or until cheese is lightly browned and bubbly. Garnish with lemon slices and fresh chives.
