1. Preheat the oven to 425°F. Line a half-sheet pan with parchment paper. 2. In a food processor, pulse the cheddar, cream cheese, beer, bourbon, paprika, and mustard until smooth, scraping the bowl occasionally. Season to taste with salt and pepper. Transfer to a large resealable plastic bag. 3. Unwrap and unfold the puff pastry sheets. Cut each into 9 3-inch squares. Snip a 1/2-inch hole in the corner of the bag with the cheese mixture. Pipe the cheese mixture onto one half of each pastry square, leaving a ½-inch rim. 4. In a small bowl, beat the egg with 1 tablespoon water. Brush the egg wash on the rim of a pastry square. Fold the pastry in half to form a triangle and press the edges to seal, then press with the tines of a fork. Repeat with the remaining pastries. Transfer to the prepared pan, spacing ½ inch apart. Brush the tops of the pastry with the egg wash. 5. Bake until golden brown, about 20 minutes. Transfer to a wire rack to cool, leaving behind any cheese that may have oozed out of the pastry. Serve warm or room temperature.