01 - Combine cream cheese, unsalted butter, dill (if using), salt, and pepper in a mixing bowl. Mix until smooth and homogenous.
02 - Evenly spread the cream cheese mixture onto each slice of bread using a butter knife or offset spatula.
03 - Arrange cucumber slices in overlapping rows over half of the prepared bread slices.
04 - Place the remaining bread slices on top, cream cheese side down, to form sandwiches.
05 - Gently press each sandwich and cut into quarters, either rectangles or triangles, using a sharp knife. Serve immediately or cover with a damp paper towel and refrigerate until serving.