Bacon-and-Egg Breakfast Tarts

INGREDIENTS

• 1 sheet purchased frozen puff pastry, about 10 by 14 inches, thawed
• 3/4 cup shredded white cheddar or Gruyère cheese
• 1/3 cup crème fraîche or sour cream
• 12 thick slices applewood-smoked bacon
• 1 Tbs. olive oil
• 6 eggs
• Kosher salt and freshly ground pepper, to taste
• 1 Tbs. roughly chopped fresh chives