Savory Puff Pastry Tart with Smoked Salmon

Preheat the oven to 350 degrees F (175 degrees C). Grease a tart pan. Combine eggs, creme fraiche, parsley, chives, salt, and pepper in a bowl and mix until well combined. Line the greased tart pan with puff pastry. Spread smoked salmon over the bottom, followed by Gruyere cheese. Pour egg mixture on top. Bake in the preheated oven until eggs have set and puff pastry has risen and browned, about 45 minutes.