My sister makes these for every baby shower and they vanish in minutes. Nobody guesses it only needs 4 ingredients.

Arrange a single layer of cucumber slices over half of the bread slices, covering the surface but not piling them too thickly. The cucumbers should sit flat so the sandwiches stay neat when cut.
Top each cucumber-covered slice with a second slice of bread, cream cheese side down, to form sandwiches. Press very gently with your palm so everything adheres without squishing the filling out.
Use a sharp knife to trim off all the crusts from each sandwich, creating neat squares. Save the crusts for snacks or breadcrumbs if you’d like.
Cut each crustless sandwich into two triangles (or into four small squares if you prefer bite-size pieces). Wipe the knife with a damp cloth between cuts to keep the edges clean.
Arrange the cucumber sandwich triangles closely together on a silver serving tray or your favorite platter. Cover the tray loosely with plastic wrap and refrigerate for at least 30 minutes before serving so they chill and firm up a bit.
Serve the sandwiches slightly chilled. They’re best enjoyed the same day you make them, especially within a few hours, when the bread is still soft and the cucumbers are crisp.
Variations & Tips
For little ones who are unsure about cucumbers, you can make half the batch with just the cream cheese spread and slice those into smaller squares—they look like part of the same tray but are a bit simpler. If you need to make these ahead for a busy party day, assemble and cut the sandwiches, then layer them in an airtight container between sheets of wax paper and refrigerate for up to 8 hours. For a slightly sturdier bite, choose a denser, bakery-style white bread instead of ultra-soft sandwich bread. You can also peel the cucumbers if your family doesn’t like the texture of the skin, or use mini seedless cucumbers for extra tender slices. To stretch the recipe for a larger crowd, make the sandwiches open-faced: spread the cream cheese mixture on each bread slice, top with a single layer of cucumbers, trim off the crusts, and cut into small rectangles. If you have picky eaters at home, let them help cut the sandwiches into fun shapes with cookie cutters—stars or hearts make them feel special, even though the recipe is still the same easy four ingredients.