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French Onion Soup Bites

All the rich, savory flavor of classic French onion soup, transformed into a perfect, poppable appetizer. Caramelized onions, Gruyère cheese, and a buttery crust come together in these irresistible bites.
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Prep Time 20 minutes
Cook Time 22 minutes
Total Time 42 minutes
Servings: 24 servings
Course: Appetizer
Cuisine: French-American
Calories: 85
Ingredients Equipment Method Notes

Ingredients
  

  • 2 tbsp Unsalted butter
  • 2 tbsp Olive oil
  • 2 large Yellow onions thinly sliced (about 1 lb total)
  • 1 tsp Granulated sugar helps with caramelization
  • 1 tsp Fresh thyme leaves or 1/2 tsp dried
  • 2 tbsp Dry sherry or white wine optional but recommended for depth
  • 1 cup Beef broth use low-sodium for better control
  • 1 sheet Frozen puff pastry thawed according to package (usually 1 hour at room temp)
  • 1 cup Gruyère cheese freshly grated (about 4 oz)
  • 1 large Egg for egg wash
  • 1 tbsp Water
  • Kosher salt and black pepper to taste

Equipment

  • Large skillet (10-12 inch)
  • Baking sheet
  • Parchment paper
  • Rolling Pin
  • Sharp knife or pizza cutter
  • Pastry brush

Method
 

  1. Caramelize the onions. In a large skillet over medium-low heat, melt the butter with the olive oil. Add the thinly sliced onions and sprinkle with the sugar and a pinch of salt. Cook, stirring occasionally, for 20-25 minutes until deeply golden brown and soft. Stir in the thyme and sherry (if using), scraping up any browned bits. Add the beef broth and simmer for 3-4 minutes until most liquid is absorbed. Season with pepper, remove from heat, and let cool slightly.
  2. Prepare the pastry. Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper. On a lightly floured surface, roll the thawed puff pastry sheet into a 12x12 inch square. Using a sharp knife or pizza cutter, cut the pastry into 24 equal squares (a 6x4 grid).
  3. Assemble the bites. Place the pastry squares on the prepared baking sheet, leaving about 1/2 inch between them. Spoon about 1 heaping teaspoon of the cooled onion mixture onto the center of each square. Top each with a generous pinch of grated Gruyère cheese.
  4. Bake to perfection. In a small bowl, whisk the egg with 1 tablespoon of water to make an egg wash. Lightly brush the exposed edges of each pastry square with the egg wash. This will give them a beautiful golden shine. Bake for 18-22 minutes, or until the pastry is puffed and deep golden brown and the cheese is bubbly.
  5. Serve and enjoy. Let the bites cool on the baking sheet for 5 minutes before transferring to a serving platter. Trust me, this brief rest allows the filling to set slightly so it doesn't run out when you bite into it. Serve warm and watch them disappear!

Notes

Chef's Tips:
• For the best flavor, take your time caramelizing the onions. Low and slow is the rule.
• Do not overfill the pastry squares, or the filling will leak and cause sticking.
• These are best served the same day, but can be reheated in a 350°F oven for 5-7 minutes to crisp up.
Food Safety:
• Ensure onions are cooled slightly before assembling to prevent the pastry from becoming soggy before baking.
• Store any leftovers in the refrigerator within 2 hours of baking.