Combine the cream cheese and heavy cream in a bowl with a hand mixer on medium speed (or use your stand mixer fitted with the whisk attachment) until creamy and smooth.
Add the lemon zest and juice, dill, chives, parsley, salt, pepper and garlic powder and mix well until combined and the mixture is creamy.
Scrape down the sides of the bowl to ensure everything is well incorporated and add the mixture to a piping bag fitted with an open star tip (or other tip of your choice).
You can let the cream cheese mixture sit in the fridge for an hour or even overnight to let the flavours intensify, OR assemble right away.
Slice the cucumber into 24 thick slices.
Slice the smoked salmon into squares approximately the same size as the cucumber slices.
Place one piece of the salmon onto each cucumber slice and arrange them on a tray or board for serving.
Pipe a dollop of the cream cheese mixture onto each of the cucumber slices with salmon.
Top with a small sprig of fresh dill or some finely chopped chives.
Serve immediately, or store in the fridge assembled up to 2 hours before serving.
Notes
Make Ahead Instructions
Prepare the cream cheese mixture up to 24 hours ahead of serving. Store in the fridge and let sit for 10-15 minutes at room temperature before slicing the cucumber and salmon and assembling.