· In food processor, with chopping blade, process watercress and parsley until finely chopped.
· Add butter, cream cheese, chives, salt and pepper; process until mixture turns green.
· Spread mixture on half the bread slices and top with remaining slices. Cut each sandwich diagonally into 4 triangles. Place on a tray or plate; cover with slightly damp paper towel and plastic wrap. Refrigerate until serving time.