Preheat your oven to 350°F (180°C) and line a baking sheet with parchment paper.
Drain the canned tuna and place it in a bowl. Finely chop the red onion, dice the bell pepper, and finely chop the parsley.
Heat the olive oil in a skillet over medium heat. Add the red onion and sauté for 2 minutes. Then, add the bell pepper and sauté for another 3 minutes.
Add the sautéed vegetables to the tuna, then mix in the cream cheese, parsley, salt, and pepper to taste.
Roll out the puff pastry on a lightly floured surface and cut it into equal-sized triangles. Place a portion of the filling on the wider end of each triangle.
Carefully roll up the triangles into croissant shapes, starting from the wider end. Be careful not to let the filling spill out.
Brush the tops of the croissants with the beaten egg to give them a beautiful golden-brown color while baking.
Place the croissants on the prepared baking sheet and bake for 20-25 minutes, or until golden brown.
Let the croissants cool for a few minutes before serving warm or slightly cooled.
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