French Onion Rigatoni Skillet with Gruyere and Parmesan Tips, FAQ & printable recipe

Tips for success

Grate the cheese just before you use it. Freshly grated Gruyere and Parmesan melt more smoothly and produce a glossier sauce than pre-shredded cheese, which contains anti-caking starches. A box grater with fine holes gives the best texture for folding into the hot pasta, and it takes only a few minutes. Keep the grated piles cool on a plate until they go into the skillet.

Use a light hand with the salt until the end. Broth, butter and the cheese all bring their own salt, so tasting before the final seasoning prevents an overly salty dish. Add black pepper generously, since it balances the sweetness of the onions and the richness of the cheese. Taste once the cheese has melted, then adjust with a pinch of salt only if the dish needs it.

Variations

• Extra Caramelized Onion: Use four onions instead of three and cook them a few minutes longer for an even sweeter, more intense onion flavor. The extra onions will make the sauce richer and give the top a deeper golden color when it bakes in the oven.
• Garlic Herb Crumb: Toast a handful of plain breadcrumbs in butter with a little minced garlic and chopped thyme until golden. Scatter the crumbs over the top before baking to add a crisp, crunchy layer that contrasts well with the creamy pasta below.
• Swiss Cheese Version: Swap the Gruyere for the same weight of mild Swiss cheese, which melts smoothly and gives a milder, slightly sweet flavor. The sauce stays creamy and the top bakes to the same bubbling golden finish as the original recipe.
• Chicken Broth Lighter: Use chicken broth or vegetable broth in place of beef broth for a more delicate, less intense savory flavor. The onions still provide plenty of depth, so the dish remains rich and comforting while the flavor feels a little brighter.

Storage and make-ahead

Fridge

Refrigerate leftovers in a sealed container within two hours and eat them within three to four days for the best texture.

Reheat

Reheat single portions in a skillet over medium-low heat with a splash of broth, stirring until warm and glossy.

Let the skillet cool for no more than 2 hours at room temperature before storing any leftovers. Transfer the pasta to a shallow airtight container so it cools quickly and evenly, then seal it and place it in the refrigerator. Keep it refrigerated and use it within three to four days for the best texture and flavor.

The sauce will thicken as it chills, which is normal and does not affect the taste. Reheat only the portion you plan to eat, and avoid repeated reheating, which can dry the pasta and make the cheese grainy. Storing the leftovers in portions also makes it easier to reheat evenly.

You can caramelize the onions up to two days ahead, which makes this dish an efficient weeknight option. Cool the onions completely, transfer them to an airtight container and keep them refrigerated. When you are ready to cook, warm the onions in the cast iron skillet over medium heat, then continue with the pasta, broth and cheese as directed.

You can also grate the Gruyere and Parmesan in advance and store the shreds in a sealed bag in the refrigerator for up to two days. Cook the rigatoni fresh on the day you serve it, because pasta cooked in advance becomes soft and absorbs too much liquid when tossed again.

Serving ideas

Serve the French onion rigatoni straight from the cast iron skillet while the top is still bubbling and the cheese is pulling into long strands. The skillet keeps the dish hot at the table and makes serving easy. Give each guest a generous spoonful, making sure to scoop from the bottom where the onions and sauce have collected.

The rich, savory flavor pairs well with a simple green salad dressed with lemon and olive oil, which adds a bright, fresh contrast to the cheesy pasta. A crusty bread or a glass of dry white wine also complements the dish nicely for a relaxed dinner.

For a casual gathering, present the skillet in the center of the table with a spoon and fork for serving, and let everyone help themselves. Scatter the reserved fresh thyme leaves over the top just before bringing the dish to the table so the color and aroma stay bright.

Because this dish is hearty and filling, it works best as a main course with a light side, such as roasted vegetables or a crisp cucumber salad. Leftover portions reheat well and make a satisfying lunch the next day.

Frequently asked questions

Recipe card

French Onion Rigatoni Skillet with Gruyere and Parmesan

Prep 20 minCook 55 minRest 5 minTotal 1 h 20 minServes 4

Ingredients

• 3 large yellow onions, halved and sliced into thin half-moon rings
• 3 cloves garlic, minced
• 4 sprigs fresh thyme, leaves stripped, plus more leaves for garnish
• 3 tbsp unsalted butter
• 1 tbsp olive oil
• kosher salt and black pepper to taste
• 8 oz dry rigatoni pasta
• 2 cups beef broth
• 4 oz Gruyere cheese, finely grated
• 2 oz Parmesan cheese, finely grated, plus more for the top

Instructions

1. Halve the yellow onions, peel them and slice each half into thin half-moon rings. Mince the garlic and strip the thyme leaves from the sprigs. Grate the Gruyere and the Parmesan on a box grater and set the piles aside on the board.
2. Heat the olive oil and 1 tbsp butter in the cast iron skillet over medium heat. Add the onions with a pinch of salt and cook, stirring every few minutes, for about 30 minutes until deeply golden, sweet and jammy. Stir in the garlic and thyme leaves for the last minute.
3. Bring a large pot of salted water to a boil. Cook the rigatoni until just al dente, about 2 minutes less than the package directions, then drain it well. Keep the pasta warm while you finish the sauce.
4. Pour the beef broth into the skillet with the onions and bring it to a simmer. Add the drained rigatoni and the remaining 2 tbsp butter. Toss over medium heat until the pasta absorbs the savory onion liquid and turns glossy.
5. Remove the skillet from the heat. Scatter the grated Gruyere and most of the Parmesan over the pasta and fold them in until melted and smooth. Season with black pepper and adjust the salt to taste.
6. Scatter the remaining Parmesan over the surface. Bake the skillet in the oven at 425°F (220°C) for 8 to 10 minutes, until the top is bubbling and golden brown with browned spots.
7. Let the skillet rest for 5 minutes so the cheese sets slightly. Scatter fresh thyme leaves over the top and serve straight from the skillet, pulling up the long cheese strands with a spoon and fork.

Contains: gluten, milk

Estimated nutrition per serving

Calories

640

Protein

26 g

Carbohydrates

66 g

Fat

29 g

Fiber

4 g

Sugar

10 g

Sodium

1100 mg

Automatic estimate from the ingredient list, not laboratory-verified.