01 - Blend cream cheese, butter, dill if using, salt, and pepper in a small mixing bowl until smooth and thoroughly combined.
02 - Evenly spread the cream cheese mixture onto each slice of sandwich bread using a butter knife or offset spatula.
03 - Arrange cucumber slices in overlapping rows on half of the prepared bread slices.
04 - Place the remaining bread slices, cream cheese side down, over the cucumbers, gently pressing to secure each sandwich.
05 - Using a sharp knife, trim sandwiches into quarters—either rectangles or triangles. Serve immediately or cover with a damp paper towel and refrigerate for later.