1Thaw puff pastry according to package directions.
2Preheat the oven to 400 degrees F (200 degrees C).
3Line a baking sheet with parchment.
4In a large mixing bowl combine chicken, cream cheese, shredded cheese, bacon, jalapeños, ranch seasoning, salt and pepper and mix well until combined. Set aside.
5Using a rolling pin, roll out a sheet of pastry puff on a lightly floured surface until smooth.
6Cut pastry puff sheet into 9 squares.
7Place a tablespoon of the chicken mixture in the center of each square.
8Fold each square in half into a triangle and seal the edges using a fork. Repeat with remaining pastry puff sheets.
9Place stuffed puffs onto prepared baking sheet and lightly brush the tops with butter.
10Bake in the preheated oven until tops are golden brown, 10 to 12 minutes.