French Onion Pasta Bake (Printable)

Creamy baked pasta infused with caramelized onions and melted Gruyère for a savory, rich dish.

# What You’ll Need:

→ Pasta

01 - 10.5 oz short pasta such as rigatoni or penne

→ Onions

02 - 3 large yellow onions, thinly sliced
03 - 2 tablespoons unsalted butter
04 - 1 tablespoon olive oil
05 - 1/2 teaspoon salt
06 - 1/2 teaspoon sugar
07 - 2 cloves garlic, minced

→ Flavorings

08 - 1 tablespoon fresh thyme leaves or 1 teaspoon dried thyme
09 - 1/2 cup dry white wine
10 - 2 cups low-sodium beef or vegetable broth
11 - 1 tablespoon Worcestershire sauce
12 - Freshly ground black pepper to taste

→ Sauce and Cheese

13 - 1/2 cup heavy cream
14 - 1 cup grated Gruyère cheese
15 - 1/2 cup grated mozzarella cheese
16 - 1/3 cup grated Parmesan cheese

→ Topping

17 - 1/3 cup grated Gruyère cheese
18 - 2 tablespoons chopped fresh parsley, optional

# How-To:

01 - Preheat oven to 400°F. Lightly grease a baking dish approximately 8x12 inches.
02 - Cook pasta in salted boiling water 2 minutes less than package instructions. Drain and set aside.
03 - In a large skillet over medium heat, melt butter with olive oil. Add onions, salt, and sugar. Cook, stirring frequently, for 20 to 25 minutes until deep golden and caramelized.
04 - Add garlic and thyme to the skillet; cook for 1 minute until fragrant.
05 - Pour in white wine, scraping the bottom to deglaze. Cook until wine reduces by half, approximately 3 minutes.
06 - Stir in broth and Worcestershire sauce. Simmer for 5 minutes. Season with black pepper to taste.
07 - Reduce heat to low. Stir in heavy cream and remove from heat.
08 - Combine cooked pasta, caramelized onion mixture, Gruyère, mozzarella, and Parmesan in a large bowl. Mix well.
09 - Pour mixture into prepared baking dish. Sprinkle with remaining Gruyère cheese.
10 - Bake for 15 to 20 minutes until golden and bubbling.
11 - Let rest for 5 minutes. Garnish with chopped parsley before serving, if desired.

# Expert Advice:

01 -
  • Those caramelized onions taste like they've been babied for hours, but the whole dish comes together in one evening.
  • It bridges soup and bake in a way that feels indulgent without demanding restaurant-level technique.
  • The cheese melts into crevices of pasta while the edges turn crispy, creating textures that make you want seconds before you've finished your first bite.
02 -
  • Those onions need patience and medium heat, not a blasted pan on high—rush them and they'll taste sharp and stringy instead of sweet and tender.
  • The pasta being slightly undercooked is not a mistake but essential, because it continues cooking in the oven and in the residual heat of the sauce.
03 -
  • Don't skip the resting period after baking—those 5 minutes allow the sauce to set slightly, so when you serve it, you get defined layers of pasta and sauce instead of soup.
  • If your baking dish is shallow and wide, the cooking time might be shorter, so check at the 12-minute mark rather than waiting until 15.
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