This creamy roasted onion pasta comes together with roasted garlic, a splash of cream, a bit of chili crisp for heat, and a squeeze of lemon to keep everything balanced. It’s the kind of dish that feels cozy and full of flavor, but doesn’t take much hands-on time to pull off.

Ingredients

• 2 large onions, thinly sliced
• 1 whole garlic head
• 2 tablespoons chili crisp
• 1 1/2 cups heavy cream (or coconut milk)
• 1 tablespoon soy sauce, optional
• 1/2 cup freshly grated Parmesan cheese (or vegan cheese)
• Juice of 1/2 lemon
• 2 tablespoons fresh parsley, finely chopped
• 12 oz (340 g) pasta of choice
• 5 tablespoons olive oil
• Pasta water, as needed

Seasonings

• 1 tablespoon paprika
• 2 teaspoons garlic powder
• 2 teaspoons salt
• 2 teaspoons black pepper
• 2 teaspoons Italian seasoning

Instructions

Preheat the oven.
Preheat your oven to 400°F. Add the sliced onions to a large baking dish.

Season the onions.
Sprinkle the onions with paprika, garlic powder, salt, black pepper, and Italian seasoning. Drizzle with 4 tablespoons olive oil, then toss until the onions are evenly coated.

Add the garlic.
Slice about 1/4 inch off the top of the garlic head to expose the cloves. Drizzle with the remaining 1 tablespoon olive oil, sprinkle with a small pinch of salt, and place it cut-side up on top of the onions.

Roast the onions.
Cover the baking dish tightly with foil and bake for about 1 hour. Toss the onions every 20 minutes, adding a small splash of water each time to keep them from burning. They should be deeply golden, soft, and jammy.

Cook the pasta.
While the onions roast, cook the pasta in salted boiling water until al dente. Reserve up to 1 cup of pasta water before draining.

Add the roasted garlic.
Remove the baking dish from the oven. Let the garlic cool slightly, then squeeze the soft cloves into the onions. Mash and stir them through the onion mixture.

Make the sauce.
Add the chili crisp, heavy cream, soy sauce if using, lemon juice, Parmesan, and cooked pasta directly to the baking dish. Toss everything together, adding pasta water a little at a time until the sauce turns creamy, glossy, and coats the pasta well.

Finish with parsley.
Fold in the chopped parsley at the end. Taste and adjust salt if needed. Serve with extra Parmesan, more chili crisp, and a little more parsley on top.

If this creamy roasted onion pasta made you hungry, save it for later—pin the image below so you’ve got it ready next time you need something this good.

Quick tips (that actually matter)

• Don’t skip tossing the onions while roasting—this is what keeps them from burning and helps them caramelize evenly.
• If your sauce feels too thick, pasta water is your best fix—add a little at a time.
• Chili crisp levels vary a lot, so start with less if yours is very spicy.
• The lemon at the end cuts through the richness—don’t leave it out.

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.