Set the cream cheese on the counter until it is fully soft. Cold cheese gets lumpy and tears the bag when you pipe it. I leave it out while I gather everything else.
Add the cream cheese to a bowl with 2 teaspoons of everything bagel seasoning. Stir until the flecks spread evenly through the cheese. Don't add milk or sour cream, because it needs no help.
Cut the cucumbers into rounds about ¼ inch thick. Leave thin skins on, or peel off a few stripes if the skin feels thick. If you spot big seeds, scoop them out lightly with a small spoon.
Lay the slices out and let them rest for 10 to 15 minutes at room temperature. They will release extra moisture during this time. Pat each one dry with paper towels so the filling stays put.
Spoon the cream cheese mixture into a piping bag with a star tip. Pipe a small swirl onto each cucumber slice. A zip-top bag with a snipped corner works too.
Sprinkle a little more seasoning over the top. Add a tiny herb sprig if you like. Arrange the bites on a platter and serve them chilled.