Bake sheet with butter or grease and preheat oven to 400°F.

Stir the butter, paprika, parsley, lemon zest, lemon juice, salt, and pepper until well combined.

The entire fillet should be covered on both sides with the butter mixture. Added some additional salt and pepper (optional)

Fish should be cooked through and opaque in the centre before being transferred to a baking sheet. (This took approximately 25 to 30 minutes with a fish of this size; cooking times vary with thickness.)

While preparing the Provençale sauce, transfer the fish to a plate and tent with foil for a short while.