Healthy Avocado Egg Salad and Salmon Sandwich

large hard-boiled eggs

large hard boiled egg whites (discard the rest)

medium hass avocado, cut into 1/2-inch dice

light mayonnaise

Dijon mustard

caper brine (optional)

finely chopped fresh chives or dill

Kosher salt

freshly ground pepper

thin slices cucumber

slices (4 oz) Wild Nova salmon

slices whole grain sliced bread, toasted