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 it has risen.
04 - Whisk together eggs, heavy cream, salt, pepper, and smoked paprika in medium bowl until fully combined.
05 - Sprinkle grated cheddar evenly over pastry center, staying within border. Pour egg mixture over cheese.
06 - Top with chopped bacon, halved cherry tomatoes, spinach, and green onions, distributing evenly across surface.
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 fresh chives over top before serving.
09 - Cut tart into portions and serve warm while pastry remains crisp.