Preheat the oven to 200*C/400*F/ gas mark 6. Have ready a small baking dish with sides, large enough to hold the salmon fillets in a single layer with some space between them.
Pat your salmon dry. Season on the bottom with salt and black pepper. Place into the casserole dish. Season on top.
Whisk together the melted butter, mustard, honey and garlic. Spoon this mixture evenly over the fillets.
Bake in the preheated oven for 13 minutes or until the fish tests one. It should flake easily with the tines of a fork.
If desired you can pop it briefly under a hot grill to gild it a bit. Sprinkle with parsley and serve immediately.