In a medium bowl, stir together ham, cranberries, celery, and walnuts.
In a separate bowl, whisk together mayonnaise, mustard, lemon juice, and seasoned salt. Add to ham mixture, stirring well to combine. Spread ¼ cup ham mixture onto each of 8 bread slices. Top each with a remaining bread slice to make 8 whole sandwiches.
Using a serrated bread knife in a gentle sawing motion, trim and discard crusts from sandwiches. Cut each sandwich diagonally to make 2 triangles. Serve immediately, or cover with damp paper towels, place in a covered container, and refrigerate for a few hours until serving time.
Notes
Make-Ahead Tip: Ham salad can be made up to 3 days in advance, covered tightly, and refrigerated until needed.
Recipe by TeaTime Magazine at https://teatimemagazine.com/cranberry-walnut-ham-salad-tea-sandwiches/