Creamy Roasted Red Pepper Pasta Recipe

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I published this recipe for Creamy Roasted Red Pepper Pasta a few years ago after a total kitchen flop. I was trying to impress a friend who was coming over for dinner, and my planned sauce just… broke. It was a disaster. If you love the flavor of roasted peppers, you should also try my Roasted Red Pepper & Cajun Potato Soup.

In a panic, I stared into my fridge. I saw a jar of roasted red peppers I had meant to use for a salad. I had some raw cashews soaking for a different project. I thought, “What if I just blend it all together?” That moment of desperation became my favorite pasta sauce ever.

I love this technique because it feels like magic. You take a few simple, vitamin-rich ingredients, give them a quick roast, and whir them into the creamiest, most vibrant sauce. No dairy needed. It’s my go-to for a quick, impressive, and healthy weeknight meal that always feels special.

Recipe Overview

Cuisine: Italian-Inspired
Category: Main Dish
Prep Time: 15 minutes
Cook Time: 25 minutes
Total Time: 40 minutes
Servings: 4

Why This Recipe is So Special

This isn’t just another tomato sauce. The magic happens in the blender. Roasting the vegetables, especially the garlic, unlocks a deep, sweet, and smoky flavor you just can’t get from a jar.

Blending it with soaked cashews creates a luxuriously smooth texture that clings to every noodle. It’s naturally a vegan option, but it’s so rich and satisfying that no one ever misses the cream. It’s a powerhouse of flavor and nutrition in one bowl.

The Full Ingredient List

Gathering your ingredients is the first step to kitchen success. I always line everything up on my counter. It makes the process so much easier and more enjoyable.

3 large red bell peppers, halved and seeded
1 medium yellow onion, quartered
4-5 whole garlic cloves, unpeeled
2 tbsp olive oil, divided
1/2 cup raw cashews, soaked in hot water for at least 30 minutes
1/2 cup vegetable broth, plus more if needed
2 tbsp nutritional yeast (for a cheesy flavor)
1 tbsp tomato paste
1 tsp smoked paprika
1/2 tsp crushed red pepper flakes (optional)
Salt and black pepper to taste
12 oz pasta of choice (rigatoni or fettuccine work great)
Fresh basil, for garnish

My Step-by-Step Method

Follow these steps and you really can’t go wrong. I’ve made this dozens of times, and this order works perfectly every single time.

Preheat your oven to 425°F (220°C). Line a baking sheet with parchment paper.
Toss the pepper halves, onion quarters, and unpeeled garlic cloves with 1 tablespoon of olive oil. Spread them out on the baking sheet. The garlic will steam in its skin and become sweet and soft.
Roast for 20-25 minutes, until the peppers are charred in spots and everything is very tender.
While the vegetables roast, cook your pasta in well-salted water according to package directions. Save about 1 cup of the starchy pasta water before draining.
Let the roasted veggies cool for a few minutes. Then, squeeze the roasted garlic out of its papery skins into your blender.
Add the roasted peppers and onion to the blender. Drain the soaked cashews and add them in, too.
Pour in the vegetable broth, nutritional yeast, tomato paste, smoked paprika, red pepper flakes, and the remaining 1 tablespoon of olive oil.
Blend on high for a full 1-2 minutes. You want it completely smooth and creamy. If it’s too thick, add a splash more broth.
Season the sauce generously with salt and black pepper. Give it a taste and adjust—this is your moment to make it perfect for you.
Combine the drained pasta and the sauce in the warm pot. Toss it all together, adding a little reserved pasta water if needed to make the sauce silky and help it coat the noodles.
Serve immediately, topped with fresh basil and an extra crack of black pepper.

My Top Tips for Success

Soak Those Cashews: Don’t skip soaking! It’s the key to a smooth sauce. If you’re in a rush, pour boiling water over them and let them sit while you prep the other ingredients.
Char is Good: Don’t be afraid of dark, blistered spots on your peppers. That charred flavor is the soul of this sauce. It adds a wonderful smoky depth.
Use Pasta Water: That starchy water is liquid gold. It helps the sauce emulsify and stick to the pasta beautifully. Always save a cup!
Blend, Blend, Blend: Be patient with your blender. Let it run for a full minute or two. This ensures the cashews are fully pureed for the creamiest result.

Common Mistakes to Avoid

I’ve learned from my own errors so you don’t have to. Here are the big ones to watch for.

Not Seasoning the Sauce Enough: Blender sauces often need a good hit of salt and pepper at the end. Taste it after blending and don’t be shy! The flavors need that boost.
Using Cold Liquids: Make sure your vegetable broth isn’t ice-cold from the fridge. Room temp or warm broth helps everything blend together more smoothly.
Skipping the Roast: You could use jarred peppers, but roasting your own makes a world of difference. The fresh, sweet flavor is unbeatable and it’s so easy. For another recipe that makes the most of roasted vegetables, check out my roasted red pepper and Cajun potato soup recipe.

NUTRITION INFORMATION

Calories: ~480
Carbohydrates: 78g
Protein: 16g
Fat: 14g
Saturated Fat: 2g
Fiber: 7g
Sugar: 10g

(Note: This is an estimate per serving. Values can vary based on specific ingredients used.)

FREQUENTLY ASKED QUESTIONS

Can I make this sauce ahead of time?

Absolutely! The sauce keeps beautifully in the fridge for up to 4 days. Just store it in a sealed container. It will thicken when cold, so thin it out with a little broth or water when you reheat it.

I don’t have a high-speed blender. Will a regular one work?

It can, but you’ll need to blend it longer. Soak your cashews for a full hour to make them as soft as possible. You might still get a slightly grainier texture, but the flavor will still be fantastic.

What’s a good substitute for cashews?

For a nut-free version, try raw sunflower seeds (soaked the same way) or a 1/2 cup of canned white beans, like cannellini. The beans will change the flavor slightly but will still give you a lovely creamy base.

Creamy Roasted Red Pepper Pasta Recipe

Recipe Overview

Why This Recipe is So Special