Preheat oven to 400°F. Using electric mixer, beat together cream cheese and sour cream until smooth; beat in egg yolk and mustard. Stir in bacon, chives, basil, parsley, garlic and pepper; refrigerate until ready to use.

Beat egg with 1 tbsp water; set aside. On lightly floured surface, unroll each sheet of pastry; cut each sheet into 9 squares. Place on parchment paper–lined baking sheet, about 2 inches apart.

Using sharp paring knife, score 1/2-inch border around each pastry square (if pastry is too soft to work with, pop into freezer for a few minutes). Spoon 2 tsp filling onto center of each pastry square, inside score lines. Sprinkle Asiago cheese over top. Brush pastry with egg wash; bake for 15 to 18 minutes or until pastry is golden brown. Serve warm or at room temperature.

TIPS:
A pizza wheel is a handy tool for cutting puff pastry.
Substitute Parmesan or Pecorino for Asiago cheese if desired.
Substitute finely chopped sun-dried tomatoes or black olives for bacon if desired.