01 - Whisk together flour and salt in a bowl. Create a well in the center, crack in the eggs, and pour in half the milk. Whisk gently to incorporate, then add remaining milk and melted butter. Mix until completely smooth and let rest for 10 minutes.
02 - Heat a 9-inch non-stick skillet over medium heat. Lightly grease with butter or oil. Pour approximately ¼ cup batter into the pan, immediately tilting and swirling to coat the bottom evenly. Cook for 1-2 minutes until golden brown on the underside, then flip and cook for 30 seconds. Transfer to a plate, cover to keep warm, and repeat with remaining batter.
03 - Combine cream cheese, sour cream, chopped dill, chopped chives, lemon juice, and black pepper in a small bowl. Beat with a spoon or whisk until completely smooth and creamy.
04 - Spread a thin, even layer of the herbed cheese mixture over each crepe, leaving a small border around the edges. Arrange slices of smoked salmon over the cheese filling.
05 - Roll each crepe tightly into a cylinder or fold into quarters. Arrange on a serving platter with the seam side down.
06 - Sprinkle with additional fresh chives or dill and accompany with lemon wedges. Serve immediately while crepes are still slightly warm.