Preheat the oven to 375°F and arrange the baguette slices on a baking sheet.
Toast the baguette slices for 5 to 6 minutes, until the edges are golden and the centers are crisp.
In a bowl, mash the flaked trout with the cream cheese, lemon juice and horseradish, leaving some visible flakes of fish rather than blending completely smooth.
Fold in the chopped dill until evenly distributed.
Spread about a tablespoon of the pâté onto each toasted baguette slice.
Top each one with a few capers and a scatter of chopped chives.
Serve within 30 minutes of assembling so the toast stays crisp.
Good to Know
Make the pâté up to 2 days ahead and keep refrigerated in an airtight container; toast the bread and assemble only right before serving.