Put a skillet on the stove at medium high. And add enough olive oil to coat the bottom of the skillet then add the butter. When the butter has stopped foaming add the salmon filets to the pan with the skin side up. If your filets have been skinned the side of the filets with the gray area in the middle will be your up side.
And give the salmon just about 1 1/2 - 2 minutes a side depending on how well done that you like them and how thick they are. I check them with a table fork by stabbing it into the meat a little and gently twisting it just a little. If it wants to flake that's how we like it.
Remove them to a plate that will catch the drippings on the back of the stove or in the oven set on warm. Now add the lemon juice, white wine and the parsley leaves to the skillet. You could use rosemary, basil or sage instead of parsley if you prefer. And if you don't have fresh herbs dried will work. Just use about half as much dried as fresh.
Let the liquids come back up to sizzling and top off the filets with that good sauce from the skillet and enjoy your Lemon Butter Salmon Filets.