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.

Once everything is blended with cream, basil, and broth, the sauce turns silky and smooth, then finishes cooking right in the oven with the spaghetti.

This is the kind of dinner that looks colorful, tastes cozy, and doesn’t leave you standing over the stove the whole time. It’s simple enough for a weeknight, but it still feels like something a little more special when it lands on the table.

Why You’ll Love This Roasted Veggie Pasta

This roasted veggie pasta keeps things easy without tasting plain. Roasting the vegetables first gives the sauce a fuller flavor, and blending everything together makes it creamy without needing a long list of ingredients. The spaghetti cooks right in the sauce, which means fewer dishes and even more flavor in every bite.

You’ll love this recipe because:

• the sauce is rich, smooth, and full of roasted vegetable flavor
• roasted garlic gives it a softer, deeper taste than garlic powder
• everything bakes in one dish
• spaghetti works beautifully with the creamy sauce
• it looks vibrant and feels comforting at the same time

Ingredients

For the roasted vegetables

• 1 cup cherry tomatoes
• 1/2 red bell pepper, chopped
• 1/2 yellow or orange bell pepper, chopped
• 1/2 medium zucchini, chopped
• 1 small red onion, cut into wedges
• 1 whole garlic bulb
• 1 1/2 tablespoons olive oil

For the seasoning

• Salt, to taste
• Black pepper, to taste
• 1 teaspoon Italian seasoning
• 1/4 teaspoon red pepper flakes, optional

For the sauce

• 3/4 cup heavy cream
• 1 cup vegetable broth
• Small handful fresh basil

For the pasta

• 7 ounces spaghetti

Equipment

• Deep oven-safe baking dish
• Small piece of foil
• Blender or immersion blender
• Spoon or spatula

Instructions

1. Roast the vegetables
Preheat the oven to 425°F. Add the cherry tomatoes, bell peppers, zucchini, and red onion to a deep baking dish. Drizzle with olive oil and season with salt, black pepper, Italian seasoning, and red pepper flakes, if using.

Cut the top off the garlic bulb, drizzle with a little oil, wrap in foil, and place it in the dish. Roast for 30 to 35 minutes, until the vegetables are soft and the tomatoes have burst.

2. Blend the sauce
Squeeze the roasted garlic cloves into the dish. Add the heavy cream, vegetable broth, and basil, then blend until smooth. If the sauce seems too thick, add a small splash of broth.

3. Add the spaghetti
Break the spaghetti in half and add it to the sauce. Press it down gently so most of it is covered.

4. Bake the pasta
Return the dish to the oven and bake for 18 to 22 minutes, stirring once halfway through. If needed, add a splash of broth or hot water so the pasta cooks evenly.

5. Serve
Stir well, then serve warm with extra basil, red pepper flakes, or Parmesan on top.

Love how this Creamy Roasted Veggie Pasta turned out? Save the image below to your Pinterest board so it’s right there when you need an easy pasta dinner that still feels special.

Tips and Tricks

• Use a deep baking dish: This helps hold enough liquid for the spaghetti to cook properly.
• Do not skip the roasted garlic: It adds a sweeter, more rounded flavor that makes the sauce taste much better.
• Cut the vegetables into similar-sized pieces: That way they roast evenly and blend more smoothly.
• Stir halfway through baking: This keeps the spaghetti from clumping and helps it cook evenly.
• Add extra liquid only if needed: Ovens and baking dishes vary, so keep an eye on the sauce near the end.
• Blend until fully smooth: A silky sauce works best here because it coats the spaghetti more evenly.

Variations

This version is already full of flavor, but you can still tweak it depending on what you have on hand.

• Add a little grated Parmesan to the sauce for an even richer finish
• Stir in spinach at the end and let it wilt into the hot pasta
• Add cooked chicken on top to turn it into a heartier dinner
• Use a little more red pepper flakes if you want more heat
• Finish with burrata or torn mozzarella for a creamier serving option

Storage and Reheating

Store leftovers in an airtight container in the fridge for up to 3 days.

To reheat, warm it gently on the stove or in the microwave with a splash of broth, cream, or water to loosen the sauce. The pasta will continue soaking up liquid as it sits, so adding a little moisture helps bring it back to life.

Frequently Asked Questions

Can I use another pasta shape?

Yes, but spaghetti works especially well in this version. Short pasta can work too, though cooking time may vary slightly.

Do I have to roast the garlic separately?

Yes, it’s worth it. Wrapping the garlic in foil keeps it soft and prevents it from drying out or burning in the oven.

Can I make the sauce ahead of time?

Yes. You can roast and blend the sauce ahead, then refrigerate it until you’re ready to bake it with the spaghetti.

What if my sauce gets too thick?

Add a splash of broth or hot water and stir. That usually fixes it quickly.

Can I make it more cheesy?

Absolutely. Parmesan on top or mixed into the sauce works really well here.

Ingredients 

• 12–16 garlic cloves, peeled (about 1 large head)

• 1/2 cup extra-virgin olive oil (120 ml), plus a splash more if needed

• 1/2–1 tsp chili flakes, to taste

• 12 oz spaghetti (340 g)

• 1 1/2 tsp kosher salt for the pasta water (or salt it “like the sea”)

• Fresh parsley, finely chopped (optional)

• Parmesan, finely grated (optional, for serving)

• Black pepper, to finish (optional)

Instructions

1) Roast the garlic in oil

1. Heat oven to 300°F (150°C).

2. Add peeled garlic to a small oven-safe dish (or a small loaf pan). Pour in the olive oil so the cloves are mostly submerged.

3. Roast 35–45 minutes, until the garlic is soft enough to smash with a spoon and lightly golden (not browned and dry).

Important: Don’t add chili flakes yet unless you’re doing the “last 5–10 minutes” method.

2) Cook the pasta + save the water

1. Bring a large pot of water to a boil.

2. Salt it well, then add the pasta.

3. Cook until just al dente.

4. Right before draining, scoop out 1 1/2 cups (360 ml) of pasta water. You’ll use this to make the sauce.

3) Blend the roasted garlic into a sauce

1. Pour the roasted garlic and all the oil into a blender (or use an immersion blender in a tall container).

2. Add 3/4 cup (180 ml) of hot pasta water to start.

3. Blend until smooth and creamy.

What you’re looking for: it should look like a loose, glossy sauce—not watery, not thick like hummus.

4) Finish in a pan (this is where it turns “restaurant”)

1. Set a large pan over medium heat.

2. Pour in the blended garlic sauce.

3. Add chili flakes now and stir for 20–30 seconds (this blooms them without burning).

4. Add the drained pasta straight into the pan.

5. Toss hard for 60–90 seconds, adding extra pasta water a splash at a time, until the sauce clings and looks shiny.

If it looks dry: add pasta water.
If it looks thin: keep tossing—starch + movement thickens it fast.

5) Finish and serve

• Turn off the heat.

• Stir in parsley if using.

• Plate, then top with Parmesan and black pepper.

Parmesan note: Traditionally, aglio e olio doesn’t always use cheese, but it’s your kitchen—Parmesan works great here because the roasted garlic is mellow and sweet.

If this Roasted Garlic Aglio e Olio made you hungry, do me a quick favor—save it for later. Tap the image below and pin it to your Pinterest pasta (or weeknight dinner) board, so it’s right there the next time you’re craving garlicky noodles and don’t feel like thinking.

Tips and Tricks

• Roast until smashable: The garlic should mash easily with a spoon. If it’s still firm, the sauce won’t blend silky.

• Add chili flakes later: For the cleanest flavor, stir chili flakes into the warm sauce in the pan for 20–30 seconds (they can turn bitter if roasted too long).

• Save more pasta water than you think: Grab at least 1 1/2 cups. It’s how you control thickness at the end.

• Blend with less water first: You can always loosen the sauce in the pan, but you can’t “un-water” it.

• Toss in the pan to make it cling: Keep tossing for 60–90 seconds. That movement is what makes it glossy and coats the pasta.

• Thin vs thick fix: Dry? add a splash of pasta water. Too loose? toss a bit longer on medium heat.

• Cheese goes on top: Parmesan is best as a finishing sprinkle (not blended in), so the sauce stays smooth.