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