In a small bowl, whisk together the cream cheese, Greek yogurt, lemon juice, dill and black pepper.
Lightly toast the bread. Spread the mixture on all of the bread slices. Lay the cucumber slices over the cream cheese mixture, and top with the remaining bread slices.
Remove the crust, if desired, and cut each sandwich into four smaller squares. Serve immediately or refrigerate for up to 24 hours
Notes
Storage: Store the sandwiches in an airtight container in a fridge fro up to 24 hours.