Mix the yeast and warm milk and let sit for 10 minutes to bubble. Stir in the flour, egg yolks, and salt. Whisk the egg whites in a separate bowl until you get soft peaks then fold them into the batter.
Heat a large skillet with some vegetable oil over a medium-low heat. Dollop heaped tsps of batter into the skillet to make tiny pancakes. Cook until golden underneath then flip and cook on the other side until golden.
Top each blini with a smear of cream cheese, a small pieces of smoked salmon and a sprig of dill. Sprinkle on some fresh cracked black pepper too, if desired.