Slice the bagel in half and lightly toast it to your desired level of crispiness.
Spread the softened cream cheese evenly on each half of the toasted bagel. Sprinkle with salt and pepper. Garnish with fresh dill sprigs.
Lay the cold smoked salmon pieces on top of the cream cheese (on one half of the bagel), ensuring even coverage.
If using cucumbers, arrange the cucumber slices on top of the salmon.
Evenly distribute the drained capers and red onion slices over the salmon.
Place the top half of the bagel over the filling to form a sandwich. Enjoy.