Salmon Asap dan Sarapan Telur Mille-feuille

Bahan-bahan (8 porsi)

• 1 sheet store bought frozen puff pastry (, thawed (25 cm x 25cm / 10" x 10"))
• 8 eggs
• 1/4 cup cream or full cream milk ((double this for creamier eggs - Note 1))
• 1/2 to 3/4 tsp salt
• Black pepper
• 2 tbsp butter
• 6 oz / 200g smoked salmon
• 2/3 cup crème fraîche ((Note 2), plus more for serving (optional))
• 2 tbsp chives (, finely chopped, plus more for garnish)