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French Onion Pasta Bake with Gruyere

A comforting and indulgent pasta dish inspired by classic French onion soup, featuring deeply caramelized onions, a rich savory sauce, and gooey melted Gruyere cheese, baked to golden perfection.
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Prep Time 20 minutes
Cook Time 45 minutes
Total Time 1 hour 5 minutes
Servings: 6 servings
Course: Main Course
Cuisine: American, French
Calories: 650
Ingredients Equipment Method Notes

Ingredients
  

For the Caramelized Onions
  • 3 large yellow onions thinly sliced
  • 2 tbsp unsalted butter
  • 1 tbsp olive oil
  • 1 tsp granulated sugar
  • 1/2 tsp salt
  • 1/4 tsp black pepper
For the Sauce
  • 2 cloves garlic minced
  • 1/4 cup dry white wine like Sauvignon Blanc or Pinot Grigio (or extra beef broth)
  • 4 cups beef broth low sodium preferred
  • 1 tsp fresh thyme leaves chopped, or 1/2 tsp dried thyme
  • 1 bay leaf
  • 1/4 cup all-purpose flour
  • 1/2 cup heavy cream optional, for extra richness
  • Salt to taste
  • Black pepper to taste
For the Pasta
  • 12 oz campanelle, cavatappi, or rigatoni pasta
  • 1 tbsp olive oil
For the Topping
  • 1.5 cups shredded Gruyere cheese
  • 1/2 cup grated Parmesan cheese
  • 2 tbsp fresh parsley chopped, for garnish

Equipment

  • Large Pot or Dutch Oven
  • Large saucepan or pot
  • 9x13 inch baking dish
  • Cutting Board
  • Sharp Knife
  • Grater
  • Whisk

Method
 

Caramelize the Onions
  1. Heat 2 tbsp unsalted butter and 1 tbsp olive oil in a large pot or Dutch oven over medium-low heat. Add thinly sliced yellow onions, 1 tsp granulated sugar, 1/2 tsp salt, and 1/4 tsp black pepper. Stir to coat the onions evenly.
  2. Cook, stirring occasionally, for 30-35 minutes, or until the onions are deeply golden brown, very soft, and sweet. If they start to stick to the bottom of the pot, add a tablespoon of water or beef broth to deglaze, scraping up any browned bits.
Cook the Pasta
  1. While the onions are caramelizing, bring a large pot of heavily salted water to a rolling boil. Add 12 oz pasta and cook according to package directions until al dente. Drain well and toss with 1 tbsp olive oil to prevent sticking. Set aside.
Build the Sauce
  1. Once the onions are caramelized, add minced garlic to the pot and cook for 1 minute until fragrant.
  2. Pour in 1/4 cup dry white wine (if using) and deglaze the pot, scraping up any remaining browned bits from the bottom. Let it simmer for 2-3 minutes until the liquid is reduced by half.
  3. Sprinkle 1/4 cup all-purpose flour over the onions and stir well for 1-2 minutes to cook out the raw flour taste, creating a roux.
  4. Gradually whisk in 4 cups beef broth, about a cup at a time, ensuring no lumps form. Add 1 tsp fresh thyme leaves and 1 bay leaf. Bring the sauce to a gentle simmer, then reduce heat to low and cook for 5-7 minutes, stirring occasionally, until the sauce thickens slightly.
  5. Stir in 1/2 cup heavy cream (if using). Taste the sauce and adjust seasoning with salt and black pepper as needed. Remove and discard the bay leaf.
Assemble and Bake
  1. Preheat your oven to 375°F (190°C). Lightly grease a 9x13 inch baking dish.
  2. Add the cooked pasta to the sauce in the pot and stir gently to combine everything thoroughly, ensuring the pasta is well coated.
  3. Pour the pasta mixture evenly into the prepared baking dish.
  4. Sprinkle evenly with 1.5 cups shredded Gruyere cheese and 1/2 cup grated Parmesan cheese over the top.
  5. Bake for 20-25 minutes, or until the sauce is bubbly and the cheese topping is melted and beautifully golden brown. For extra crispiness and browning, you can broil for the last 1-2 minutes, watching very carefully to prevent burning.
Serve
  1. Let the French Onion Pasta Bake rest for 5 minutes before serving. Garnish with fresh chopped parsley.

Notes

For a deeper, richer flavor, use high-quality beef broth or homemade stock. Properly caramelizing the onions is the most crucial step for this dish's authentic French onion flavor; do not rush it. This dish can be assembled up to a day ahead, covered, and refrigerated. If baking from cold, add an extra 10-15 minutes to the baking time. Leftovers store well in an airtight container in the refrigerator for up to 3 days.