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Rich and Creamy Caramelized Onion Parmesan Pasta

Close-up of creamy caramelized onion pasta tossed in a white bowl, topped with dark caramelized onions.
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Learn how to make this incredibly rich and comforting pasta featuring deeply sweet caramelized onions and a silky Parmesan sauce. This easy recipe delivers gourmet flavor for your weeknight dinner.

Ingredients

Scale
  • 1 pound pasta (spaghetti or linguine recommended)
  • 2 tablespoons olive oil
  • 3 large yellow onions, thinly sliced
  • 4 cloves garlic, minced
  • 1/2 cup dry white wine (optional, for deglazing)
  • 1 cup vegetable broth
  • 1 cup heavy cream (or cashew cream for vegan option)
  • 1 cup freshly grated Parmesan cheese (plus more for serving)
  • 1 tablespoon fresh thyme leaves
  • 1 teaspoon salt
  • 1/2 teaspoon black pepper
  • Pinch of red pepper flakes (optional)

Instructions

  1. Heat the olive oil in a large, heavy-bottomed skillet or Dutch oven over medium-low heat. Add the thinly sliced onions and a pinch of salt.
  2. Cook the onions slowly, stirring every 5 to 7 minutes, for 30 to 40 minutes until they are deep golden brown, soft, and sweet. Do not rush this step; slow cooking creates the best flavor.
  3. Add the minced garlic and thyme to the onions and cook for 1 minute until fragrant.
  4. If using wine, pour it into the skillet to deglaze, scraping up any browned bits from the bottom. Let it reduce by half, about 2 minutes.
  5. While the onions finish, cook your pasta according to package directions until al dente. Reserve 1 cup of the starchy pasta water before draining.
  6. Reduce the heat under the onions to low. Stir in the vegetable broth and heavy cream (or cashew cream). Let the sauce simmer gently for 3 minutes to thicken slightly.
  7. Remove the skillet from the heat. Stir in the grated Parmesan cheese, salt, pepper, and red pepper flakes if using. Stir until the cheese is fully melted and the sauce is smooth.
  8. Add the drained pasta directly to the skillet with the sauce. Toss well to coat every strand. Add reserved pasta water, 1/4 cup at a time, until the sauce reaches a creamy, coating consistency.
  9. Serve immediately, topped with extra Parmesan cheese.

Notes

  • To make a vegan version, substitute the heavy cream with 1 cup of homemade cashew cream (soaked cashews blended with water until smooth) and use nutritional yeast instead of Parmesan cheese.
  • If you want a French onion pasta style, add 1/2 cup of shredded Gruyère cheese along with the Parmesan at the end.
  • For a quick weeknight pasta dinner, you can caramelize the onions a day ahead of time and store them in the refrigerator.

Nutrition

Find it online: https://tastetaught.com/caramelized-onion-pasta/