Gather your ingredients so that you have everything close at hand on the counter or table.
Prepare the Mousse
In a large mixing bowl, beat the cream cheese until smooth.
Add sour cream, lemon juice, minced onion, dill weed, horseradish, garlic powder, salt and black pepper. Mix well to combine.
Gently stir in the smoked salmon and capers. Cover and chill until ready to serve.
Make the Sandwiches or Canapes
To make the open-faced sandwiches or canapes, first prepare the bread, by buttering one side of each piece.
Remove the crusts with a sharp knife and then quarter each piece. (You may also slice into thirds to make oblong fingers.)
Spread the salmon mousse on the buttered sides of bread.
Top with thinly sliced cucumbers. If desired, garnish with fresh parsley or other herbs.
This recipe will make 30-40 open-faced sandwiches, and will serve 15-20 people.
Notes
*If desired, you may place another piece of bread on top of the cucumber to create a closed sandwich. If you choose this style, you will need an additional 10 slices of bread. Remove the crusts and slice the sandwiches after putting them together. **Unless otherwise indicated, all butter on this site is salted.