Ingredients

• ¹/₄ pound puff pastry, thawed
  
• 12 slices of bacon, cut crosswise into 1/2-inch strips
  
• 1 medium onion, halved and thinly sliced
  
• 3 large eggs
  
• ¹/₂ cup heavy cream
  
• salt and fresh ground pepper
  
• 1 ¹/₂ cups grated Gruyere (or cheddar) cheese