This one pot French onion pasta combines deeply caramelized onions, rigatoni, garlic, thyme, white wine, Gruyère, and Parmesan in a creamy, savory sauce. The pasta cooks directly in vegetable broth, absorbing the onion flavor while releasing starch that helps bring the sauce together in the same pot.

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One pot French onion pasta with rigatoni and caramelized onions in a creamy cheese sauce

Why You'll Love This French Onion Pasta

Deep caramelized onion flavor: Slowly cooking the onions until deeply golden creates the sweet and savory base that gives this pasta its French onion character.
Everything cooks in one pot: The rigatoni cooks directly in the vegetable broth, so there is no separate pot of water to boil and no pasta to drain.
Creamy and cheesy: Gruyère, Parmesan, and a small amount of cream combine with the starchy cooking liquid to create a smooth sauce that coats the pasta.
Classic French onion flavors: Caramelized onions, thyme, white wine, and Gruyère bring familiar French onion flavors into a comforting pasta dinner.

I wanted to make this pasta because I love the combination of deeply caramelized onions and melted cheese in my French onion soup, but I wanted to turn those flavors into a more substantial pasta dinner. Cooking the rigatoni directly with the onions and broth means the pasta absorbs that savory flavor as it cooks, while its starch helps create the creamy sauce without needing to prepare one separately.

The combination of caramelized onions and Gruyère is also one I use in my French onion chicken skillet, but in this recipe the rigatoni takes center stage. I add the cream, Gruyère, and Parmesan only after the pasta is tender, so they melt into the remaining cooking liquid while the soft strands of onion stay distributed throughout the sauce.

Creamy rigatoni French onion pasta topped with Parmesan, parsley and caramelized onions

Key Ingredients In One Pot French Onion Pasta

You'll find the exact measurements in the recipe card, but here's a closer look at key ingredients and why I use them.

Yellow onions: These are the foundation of the recipe. Slowly caramelizing them develops their natural sweetness and creates the deep savory flavor that runs through the finished sauce.
Garlic, thyme, and white wine: Garlic adds savory depth, thyme brings an earthy herbal note, and the white wine adds acidity while helping release all the flavorful browned onion bits from the bottom of the pot.
Rigatoni and chicken broth: Rigatoni holds the sauce in its ridges and hollow centers. Cooking it directly in the broth gives the pasta more flavor while the starch released during cooking naturally thickens the liquid.
Gruyère, Parmesan, and heavy cream: Gruyère provides a nutty, rich cheese flavor, Parmesan adds a savory finish, and the cream rounds out the sauce and gives it a smooth consistency.

How to Make One Pot French Onion Pasta

You can find the complete printable recipe with measurements below, but for now, here's a quick overview of how it goes:

Four steps for making one pot French onion pasta with caramelized onions, rigatoni, broth and cheese

1. Caramelize the onions. Cook the sliced onions in the butter and olive oil with the salt and pepper until they are very soft and deeply golden brown.

2. Add the aromatics and wine. Stir in the garlic and thyme, then add the white wine and scrape the bottom of the pot. Let it simmer until most of the wine has reduced.

3. Cook the pasta. Add the rigatoni and chicken broth, bring to a boil, then reduce to a steady simmer and cook uncovered until the pasta is al dente and most of the liquid has been absorbed.

4. Finish the sauce. Reduce the heat and stir in the cream, Gruyère, and Parmesan until the cheeses have melted and the pasta is coated in a creamy sauce.

Bowl of one pot French onion pasta with creamy sauce, caramelized onions and grated Parmesan

Four steps for making one pot French onion pasta with caramelized onions, rigatoni, broth and

Helpful Swaps

Use a different pasta: Rigatoni works particularly well because its ridges and hollow center hold the sauce, but you can also use another sturdy short pasta such as penne or ziti.
Adjust the cooking time: Different pasta shapes can absorb the broth at different rates, so check the pasta as it cooks and adjust the cooking time or liquid if needed.
Use chicken broth: If you don't need the dish to be vegetarian, you can replace the vegetable broth with low-sodium chicken broth for a slightly richer, more savory flavor.

Tips for French Onion Pasta

Slice the onions evenly: Keeping the onion slices a similar thickness helps them soften and caramelize at roughly the same rate.
Add the garlic after the onions: Wait until the onions are caramelized before adding the garlic so it has time to become fragrant without cooking long enough to burn or turn bitter.
Use low-sodium broth: Gruyère and Parmesan both add salt, so starting with low-sodium chicken broth gives you better control over the final seasoning.
Keep the pasta slightly saucy: Don't wait until every drop of broth has disappeared. The pasta should still look a little loose before adding the cream and cheese because the sauce continues to thicken as it comes together.

Storage

Store leftover French onion pasta in an airtight container in the refrigerator for up to 3-4 days. The sauce will thicken as the pasta sits, so reheat it gently in a pan over medium-low heat with a small splash of chicken broth to loosen the sauce. Stir regularly until the pasta is heated through and creamy again.

What to Serve with One Pot French Onion Pasta

This pasta is rich and creamy, so I like serving it with something fresh alongside it. My cucumber avocado feta salad adds a crisp, refreshing contrast to the caramelized onions and cheese sauce. If you prefer something warm, my garlic sourdough toast is perfect for picking up any creamy sauce left in the bowl.