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Skillet French Onion Pot Pie with Beef, Gruyère and Golden Puff Pastry

This Skillet French Onion Pot Pie combines deeply caramelized onions, tender roast beef, carrots, and aromatic herbs in a rich, savory beef gravy. Topped with melted Gruyère cheese and golden, flaky puff pastry, this comforting skillet dinner brings together the delicious flavors of French onion soup and classic beef pot pie. It's an impressive yet approachable meal for cozy family dinners and special occasions.
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Prep Time 45 minutes
Cook Time 25 minutes
Cooling Time: 10 minutes
Total Time 1 hour 20 minutes
Servings: 4
Course: Dinner
Calories: 1111
Ingredients Method Notes

Ingredients
  

  • 2 tablespoons unsalted butter
  • 2 tablespoons olive oil
  • 5½ cups thinly sliced lengthwise yellow onions
  • ½ 17.3-ounce package frozen puff pastry, thawed
  • 3 medium carrots peeled and sliced diagonally into ¼-inch-thick rounds
  • ¼ cup plus 1 tablespoon water divided
  • 1 tablespoon minced garlic
  • 2 teaspoons chopped fresh thyme plus more for garnish
  • ¾ teaspoon chopped fresh rosemary
  • ¼ cup dry sherry
  • ¼ cup all-purpose flour
  • 1¾ cups beef broth
  • 1 15-ounce package slow-simmered beef roast au jus (such as Hormel), torn into bite-sized pieces, with sauce reserved
  • ½ teaspoon kosher salt
  • ¼ teaspoon black pepper
  • 1 cup shredded Gruyère cheese
  • 1 large egg

Method
 

  1. Preheat the oven. Set the oven to 400°F (200°C). Have a 10-inch cast-iron skillet and a rimmed baking sheet ready.
  2. Caramelize the onions. Melt the butter with the olive oil in the cast-iron skillet over medium heat. Add the sliced yellow onions and cook for approximately 25 minutes, stirring frequently, until golden brown. Adjust the heat as needed to prevent burning.
  3. Prepare the puff pastry. While the onions cook, lightly flour a work surface and roll the thawed puff pastry into a 12-inch square. Cut it into 16 equal squares, each measuring 3 inches. Refrigerate the pastry squares until ready to use.
  4. Cook the carrots. Once the onions are golden brown, add the sliced carrots and ¼ cup water to the skillet. Cook for 5–6 minutes, stirring frequently, until the onions deepen in color and the carrots become tender-crisp.
  5. Add the herbs and garlic. Stir in the minced garlic, chopped thyme, and rosemary. Cook for approximately 1 minute, stirring until fragrant.
  6. Deglaze with sherry. Pour the dry sherry into the skillet. Scrape the browned bits from the bottom with a wooden spoon and cook for approximately 45 seconds, until the liquid evaporates.
  7. Add the flour. Sprinkle the flour over the onion mixture. Stir continuously for approximately 1 minute, until the flour becomes lightly browned and forms a paste with the vegetables.
  8. Prepare the gravy. Gradually pour in the beef broth, stirring to incorporate the flour mixture. Bring to a simmer over medium heat and cook for approximately 5 minutes, stirring frequently, until the gravy thickens.
  9. Add the roast beef. Stir in the bite-sized pieces of cooked beef roast along with its reserved au jus sauce. Season with kosher salt and black pepper.
  10. Add the Gruyère. Remove the skillet from the heat. Sprinkle the shredded Gruyère cheese evenly over the hot beef and onion filling.
  11. Prepare the egg wash. In a small bowl, whisk the egg with the remaining 1 tablespoon water until evenly combined.
  12. Arrange the puff pastry. Brush the pastry squares with the egg wash. Place them over the hot filling, overlapping the squares slightly to cover the entire surface.
  13. Bake the pot pie. Place the cast-iron skillet on a rimmed baking sheet. Bake in the preheated oven for 25–30 minutes, until the puff pastry is golden brown and the filling is bubbling.
  14. Rest and serve. Remove the skillet from the oven and allow the pot pie to rest for 10 minutes. Garnish with additional fresh thyme leaves and serve warm.

Notes

  • Use a 10-inch oven-safe cast-iron skillet for preparing the filling and baking the pot pie.
  • Cook the onions until deeply golden brown before adding the carrots. This step develops the signature French onion flavor.
  • Roll the puff pastry into a 12-inch square and divide it into 16 equal 3-inch squares.
  • Keep the cut puff pastry refrigerated until ready to assemble.
  • Add the prepared roast beef along with its reserved au jus sauce to enhance the gravy.
  • Slightly overlap the puff pastry squares so they cover the filling.
  • Place the skillet on a rimmed baking sheet to catch any filling that bubbles over.
  • The recipe card lists 25 minutes of cooking, while the final baking instructions specify 25–30 minutes. Bake until the pastry is golden and the filling bubbles.
  • Allow the pot pie to rest for 10 minutes before serving.