Heat oven to 375 degrees
Place aluminum foil on large baking pan or a cookie sheet. Grease foil, place side of salmon on foil on top of a few lemon slices (skin side down).
Pour olive oil and juice of one lemon over salmon. Sprinkle OPA! and place remaining lemon slices and fresh herbs (if using) on top.
Bake at 375 degrees for 15 to 20 minutes
Serve hot or chilled