Prepare the Cucumber: Start by washing the English cucumber and patting it dry. Slice it into quarter inch pieces and set on a paper towel lined plate and sprinkle a bit of salt on top of the cucumbers to draw out any extra moisture.
Mix the Spread: In a medium mixing bowl, beat together the softened cream cheese, mayonnaise, chopped fresh dill, lemon juice, garlic powder, and salt. Mix until the ingredients are well incorporated and you have a smooth, creamy spread.
Spread on Bread: Take the slices of white bread and lay them out on a clean surface, carefully cut the crusts off the sandwiches with a sharp knife. Spread a generous layer of the cream cheese mixture on the inside of each slice. The spread not only adds flavor but also acts as a barrier to prevent the bread from getting soggy from the cucumber.
Add the Cucumber: Arrange the sliced cucumbers in a single layer over half of the bread slices. You want to cover the surface area well, but avoid overloading it to keep the sandwich balanced.
Assemble the Sandwiches: Once the cucumbers are in place, top them with the remaining bread slices, spread side down, to form sandwiches.
Trim and Serve: Cut each sandwich into small squares, triangles, or rectangles as preferred. Serve immediately, or cover and refrigerate until ready to serve. They're best enjoyed fresh.