Begin by thinly slicing the 2 English cucumbers to achieve approximately ⅛-inch thick slices. Arrange them on a paper towel and sprinkle lightly with salt to draw out excess moisture while you prepare the filling.

In a medium mixing bowl, combine 1 cup of Greek yogurt and ½ cup of crumbled feta cheese. Use a fork to mash the feta into the yogurt until the mixture is creamy and well-blended. This should take about 1–2 minutes.

Finely chop ¼ cup of your chosen fresh herbs, such as dill or parsley. Stir the herbs into the yogurt-feta mixture, ensuring they are evenly distributed. Season this delightful filling with salt and pepper to taste.

Take 4 slices of whole-grain bread and spread a generous layer of the yogurt-feta mixture on one side of each slice. Arrange the cucumber slices on top of the spread on two of the slices, ensuring even coverage.

Carefully place the remaining slices of bread on top of the layered cucumbers, spread side down. Press down gently to ensure the sandwich holds together.

Using a sharp knife, cut each sandwich in half diagonally for an appealing presentation. Serve immediately.