01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - Unroll puff pastry onto prepared baking sheet. Score a 1-inch border around edges with sharp knife, without cutting through completely. Prick center area with fork.
03 - Bake pastry for 10 minutes until slightly puffed and pale golden. Remove from oven and gently press down center if puffed up.
04 - Whisk together eggs, heavy cream, salt, pepper, and smoked paprika if using in medium bowl until well combined.
05 - Sprinkle grated cheddar evenly over pastry center, staying within scored border.
06 - Pour egg mixture over cheese. Top evenly with chopped bacon, cherry tomatoes, spinach, and green onions.
07 - Return tart to oven and bake for 20 to 25 minutes until eggs are just set and pastry is golden brown.
08 - Remove from oven and let cool for 5 minutes. Sprinkle with fresh chopped chives.
09 - Slice into portions and serve warm.