Preheat your oven to 350°F (175°C).
In a medium bowl, beat the softened cream cheese and 1 tablespoon of softened butter together until smooth.
Stir in the cubed chicken, chives, salt, pepper, milk, and optional pimientos until well combined.
Unroll the crescent dough. If using crescent rolls, separate the dough into 4 rectangles and press the perforations firmly to seal them. If using a dough sheet, cut it into 4 equal rectangles.
Spoon about 1/2 cup of the chicken mixture into the center of each dough rectangle.
Bring the four corners of the dough up to the center, over the filling. Twist the corners together and pinch all the edges to seal the filling inside.
Place the squares on an ungreased baking sheet. Brush the tops with the melted butter and sprinkle evenly with the crushed croutons.
Bake for 25 to 30 minutes, or until the dough is golden brown and cooked through. The filling should be heated thoroughly.
Let the squares cool for a few minutes before serving.