This Creamy Caramelized Onion Pasta starts with slowly cooked onions that turn soft, sweet, and deeply flavorful in the pan. Once cream, Parmesan, and chili oil are added, they turn into a smooth, savory sauce that coats every piece of pasta beautifully. It’s an easy pasta dinner that feels comforting, a little special, and very hard to stop eating.
Ingredients
- 8 ounces pasta of choice
- 3 to 4 large onions, thinly sliced
- 3 tablespoons olive oil
- 1 tablespoon butter
- 1 teaspoon sugar, optional
- 4 garlic cloves, minced
- 3/4 cup heavy cream
- 1 cup grated Parmesan
- 2 tablespoons chili oil
- 1 teaspoon smoked paprika
- 1/2 teaspoon sweet paprika
- 1/2 teaspoon dried oregano
- 1 to 1 1/4 teaspoons salt, divided, plus more for pasta water
- 1/2 teaspoon black pepper
- 2 tablespoons fresh parsley, chopped, for garnish
Instructions
1. Start the onions
Set a large skillet or sauté pan over medium heat. Add the olive oil and butter. Once the butter melts, add the sliced onions along with 1/2 teaspoon salt and 1/4 teaspoon black pepper.
Cook for about 8 to 10 minutes, stirring now and then, until the onions soften and begin to lose their raw bite.
2. Caramelize them slowly
Stir in the sugar, if using. Pour in 1/2 cup water and let the onions continue cooking over medium to medium-low heat for 20 to 30 minutes. Stir occasionally so they cook evenly and do not catch on the bottom.
If the pan starts looking dry before the onions are fully golden, add another splash of water. You are looking for onions that are soft, reduced, and deep golden, not rushed or browned in patches.
3. Cook the pasta
While the onions cook, bring a large pot of well-salted water to a boil. Add the pasta and cook until al dente according to the package directions.
Before draining, reserve about 1 cup pasta water. Then drain the pasta and set it aside.
4. Add the garlic and seasonings
Once the onions are nicely caramelized, stir in the minced garlic and cook for about 30 seconds, just until fragrant.
Add the smoked paprika, sweet paprika, dried oregano, the remaining 1/2 to 3/4 teaspoon salt, the remaining 1/4 teaspoon black pepper, and the chili oil. Stir well so the onions are evenly coated.
5. Build the sauce
Lower the heat. Pour in the heavy cream and stir until combined. Let it warm through for 1 to 2 minutes, then add the Parmesan a little at a time, stirring as it melts into the sauce.
Let the sauce simmer gently for 3 to 5 minutes, just until it thickens slightly. If it feels too thick, add a splash of the reserved pasta water. The sauce should be creamy enough to coat the pasta without turning gluey.
6. Toss everything together
Add the drained pasta straight into the skillet. Toss until the noodles are fully coated and glossy. Add more pasta water, a little at a time, if needed to loosen the sauce and help it cling.
Taste and adjust with more salt, pepper, or a small drizzle of chili oil if you want a little extra heat.
7. Finish and serve
Scatter chopped parsley over the top and serve right away. Add extra Parmesan if you like.
Love this Creamy Caramelized Onion Pasta? Save the photo below to your Pinterest board so it’s there when you’re craving something rich, cozy, and easy to make.
Tips for Better Results
- Slice the onions evenly so they cook at the same speed.
- Do not rush the onions. This is where the flavor comes from.
- Use pasta water carefully. A few tablespoons can turn a thick sauce silky very quickly.
- Add the cheese over low heat so the sauce stays smooth.
- Short pasta or long pasta both work. Fettuccine, linguine, penne, and rigatoni all do well here.
