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Thinly slice cucumber using a mandolin. Slice it on the thinnest setting. You want these paper thin.
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Combine water, vinegar, sugar, salt, and peppercorns (and mustard seeds if using) in a small microwave-safe bowl. Mix to combine. Add cucumber slices. Make sure they are fully submerged in the liquid.
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Microwave the cucumber slices in liquid for 90 seconds. Set off to the side to cool and continue to pickle.
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Heat a grill pan or Panini press. Lightly coat each slice of bread with olive oil. Press between the Panini press for 3-4 seconds until golden or grill on each side until golden.
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Spread a little bit of cream cheese over each slice of bread.
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Drain the liquid from the cucumbers. Make sure there are no hidden peppercorns or mustard seeds in between each slice.
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Top each slice of bread with 4-5 slices of cucumber and a light sprinkle of fresh dill. Serve right away.