Instructions: With paper towels, pat fillets dry. Place fish in shallow baking pan, not overlapping; brush with lemon juice. Arrange onion on top of fish, dividing evenly. In bowl blend mayo & cheese; spread over fish, dividing evenly. Cover with foil & bake at 425 for 5 minutes. Remove foil & preheat broiler. Broil 4" from heat for 3 minutes until puffy & golden. Serve immediately.
**Orange roughy, hoki or other firm fish may be used.

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