• Defrost the puff pastry. Preheat the oven to 450° Fahrenheit. Cut a piece of parchment paper slightly smaller than the baking sheet.
• Roll out the dough onto the piece of parchment paper to form a wafer-thin base. Transfer the parchment paper with the rolled out puff pastry onto the baking sheet. 

Preparing the Toppings

• Use a large onion and cut it into very thin slices. Mince fresh parsley. Use 6 strips of bacon and cut into ⅛ inch strips. 
• Use a medium bowl and combine creme fraiche (or sour creme) and freshly minced parsley. Whisk until well combined. Season with salt and pepper

Making Flammkuchen

• Spread the cream cheese parsley mixture over the puff pastry. Top with the thinly sliced onions, and strips of bacon. Bake for 12-15 minutes at 450°.