Melt butter on a low flame in a small sauce pan. Add garlic and saute on low for about 1 minute. Add the lemon juice and shut off flame.
Spray the bottom of a baking dish lightly with cooking spray. Place the fish on top and season with salt and pepper. Pour the lemon butter mixture on the fish and top with fresh parsley. Bake at 400° until cooked, about 15 minutes.