Place the croissants on a sheet pan lined with parchment paper. Bake for 8 minutes, until heated through. Set aside for 5 minutes to cool slightly.
Meanwhile, in a medium bowl, combine the mascarpone, milk, chives, 1 teaspoon salt, and 1/2 teaspoon pepper.
Slice each croissant in half horizontally with a serrated knife. Spread the bottom halves with the mascarpone mixture, then sprinkle evenly with the capers and lay the salmon evenly on top. Place a few slices of red onion on top, if using. Top with a generous handful of arugula and replace the tops of the croissants, browned side up. Serve while the croissants are still slightly warm.
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