If using regular sandwich bread, lightly toast the bread to for added texture (helps prevent sogginess too).
Assemble:
Place the lettuce leaves on one slice of bread to create a moisture barrier. Top with the sliced cucumber, then spoon the cottage cheese evenly over the top. Season with a pinch of salt and pepper, if using. Top with the second slice of bread.
Serve:
Slice in half and serve immediately. This sandwich is best enjoyed fresh.