Preheat oven to 400 degrees. Line a baking pan with parchment paper.
Lay out the puff pastry sheet flat. Cut it into thirds vertically and then horizontally so you have 9 equal squares.
In a medium mixing bowl, add in the jalapenos, bacon, pepper jack and cheddar cheese, and cream cheese, Wood it with a wooden spoon until the cream cheese is thoroughly incorporated. You want the cream cheese to act as a binder for the other cheeses, jalapenos, and bacon.
Add the egg into a small bowl with 2 teaspoon water. Whisk with a fork to combine.
Brush the egg wash on top of the puff pastry squares.
Add 1 tablespoon of the jalapeno popper filling to the center of the puff pastry. I rolled mine into a ball and placed it into the center of the pastry.
Place into the oven and bake for 18 minutes until the edges are golden brown.