01 - In a medium mixing bowl, thoroughly combine the softened cream cheese, unsalted butter, finely chopped chives, finely chopped dill, kosher salt, and ground black pepper until the mixture is smooth and well incorporated.
02 - Using a shamrock-shaped cookie cutter, carefully cut out shamrock shapes from each of the 12 slices of bread.
03 - Spread a generous, even layer of the prepared herbed cream cheese mixture onto one side of half of the cut shamrock bread pieces.
04 - Arrange the thinly sliced cucumber evenly over the cream cheese spread on the bread pieces.
05 - Place the remaining plain shamrock bread pieces on top of the cucumber-layered bread to form the complete sandwiches.
06 - Gently press down on each sandwich. If desired, garnish with additional fresh chives or parsley leaves for presentation. Serve immediately.
07 - To store, cover the sandwiches with a damp towel and refrigerate until ready to serve, ensuring freshness.