Place a rack 6 inches from the broiler element and heat the broiler on high.Set the slices of baguette on a baking sheet. Brush the tops with a little olive oil.Place the baking sheet under the broiler and toast the bread until they are crispy and lightly golden on top, about 2 minutes.Whisk the Boursin cheese with the sour cream until you have a lump free creamy consistency. Take the crostini and spread the creamy cheese on top.Place the smoked salmon over the cheese spread and sprinkle with a tiny bit of smoked pepper (if you have it).To finish, garnish with fresh chives.Serve immediately.