Prep the cucumbers: Wash and dry.
Slice into 1/2-inch rounds. If you like, use a small spoon or melon baller to gently scoop a shallow divot in the center of each slice to hold the filling. Don’t scoop all the way through.
Make the cream cheese mixture: In a bowl, mix cream cheese, sour cream or yogurt, lemon juice, lemon zest, dill, and capers (if using).
Season with pepper and a small pinch of salt. Stir until smooth and fluffy.
Pipe or spoon the filling: For a neat look, transfer the mixture to a small piping bag or a zip-top bag with a corner snipped. Pipe a dollop onto each cucumber slice.
Or simply spoon it on.
Add the salmon: Cut salmon into bite-size pieces and fold a small ribbon of salmon on top of the cream cheese mixture.
Finish with garnish: Sprinkle with extra dill, a touch of everything bagel seasoning, and a crack of black pepper. Add a few extra capers if you love briny bites.
Serve: Arrange on a chilled platter and serve immediately, or refrigerate for up to 2 hours before serving.