Step 1 Heat the broiler to high. Oil a baking sheet that fits under the broiler.
Step 2 Lay the fillets on the baking sheet and season well with salt and pepper. Combine the mayonnaise, mustard and chives or parsley and spread evenly over the fish.
Step 3Place the baking sheet under the broiler 3 or 4 inches from the heat source. Broil until the topping is golden brown and the fish is just cooked through, about 2 to 4 minutes, depending on the variety of fish. Serve immediately with lemon or lime wedges.