French Onion Rigatoni with Blistered Gruyere Crust

This one-pan dinner takes the deep, sweet flavor of French onion soup and turns it into a creamy, cheesy pasta bake. Golden Vidalia onions are slowly caramelized in brown butter, then folded with al dente rigatoni and heavy cream.

A thick blanket of aged Gruyere is broiled until blistered and bubbling, creating a crisp, nutty crust that gives way to a rich, silky sauce. Every bite is a balance of sweet onions, savory cheese, and tender pasta — all cooked in a cast iron skillet for maximum flavor and minimal cleanup.

French onion soup is beloved for its deeply caramelized onions, rich broth, and gooey Gruyere topping. This recipe transforms those same flavors into a hearty pasta dish that’s both familiar and new. The key is taking the time to caramelize the onions properly — low and slow — so they become sweet, jammy, and full of umami.

Tossed with cream and rigatoni, then finished under the broiler with a thick layer of Gruyere, this skillet dinner delivers all the comfort of the classic soup in a more substantial form. It’s a satisfying meal that brings together the best of French and Italian cooking, all in one pan.

Ingredients

Why this recipe works

Caramelizing the onions slowly in brown butter is the heart of this dish. As the onions cook, their natural sugars break down and deepen, creating a sweet, savory base that infuses the entire sauce.

The brown butter adds a nutty, toasty note that complements the Gruyere and elevates the flavor beyond a simple cream sauce. This step takes time, but it’s what makes the dish taste like French onion soup in pasta form.

Broiling the cheese at the end creates a blistered, golden crust that contrasts beautifully with the creamy pasta underneath. The high heat quickly melts and browns the Gruyere, giving it a crisp texture and a deeper, more complex flavor.

This technique also makes the dish visually stunning — the bubbling, charred cheese is irresistible and adds a satisfying crunch to every forkful.

Notes and substitutions

Choose a good-quality aged Gruyere for the best flavor and melting. The cheese should be firm and slightly crystalline, with a nutty, fruity taste. Avoid pre-shredded cheese, as it often contains anti-caking agents that prevent smooth melting. Similarly, use a block of provolone and grate it yourself for the best texture and melt.

Vidalia onions are ideal because they are sweet and mild, but any sweet onion will work. If using regular yellow onions, you may need to cook them a bit longer to achieve the same sweetness. The cast iron skillet is essential for even heat distribution and for going from stovetop to broiler. If you don’t have a cast iron skillet, use an oven-safe skillet.

• Golden Vidalia onions: Any sweet onion variety, such as Walla Walla or Maui, works. Yellow onions can be used but will need a few extra minutes of cooking to become sweet.
• Aged Gruyere: Substitute with Swiss cheese or Comté for a similar nutty, melty texture. Avoid pre-shredded cheese, as it may not melt as smoothly.
• Provolone: Use low-moisture mozzarella or fontina for a similar stretch and melt. Smoked provolone adds an extra layer of flavor.
• Rigatoni: Penne, ziti, or cavatappi are good substitutes. Choose a short, sturdy shape that holds up to the thick sauce.

Equipment

• Large pot for pasta
• Colander
• Box grater
• 12-inch cast iron skillet
• Wooden spoon or spatula
• Chef's knife
• Cutting board