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Creamy roasted pepper alfredo in a white plate garnished with chopped basil
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4.91 from 30 votes

Roasted Red Pepper Sauce

This rich and creamy roasted red pepper sauce is loaded with amazing flavors from red peppers, buttery roasted garlic cloves, Parmesan cheese and fresh basil. 
Prep Time10 mins
Cook Time40 mins
Total Time50 mins
Course: Dinner
Cuisine: Italian
Servings: 6 servings
Calories: 514kcal
Author: Amy Nash


  • 4-5 red bell peppers quartered with stems and seeds removed*
  • 2 whole heads garlic [roasted] or 4 cloves garlic, minced
  • 2 Tablespoons olive oil
  • ½ medium onion diced
  • 2 Tablespoons butter
  • 1 cup chicken broth
  • ½ cup heavy cream
  • ½ cup freshly grated Parmesan cheese
  • ¼ teaspoon crushed red pepper flakes
  • Salt and pepper to taste
  • 2 Tablespoons fresh basil sliced into thin strips
  • 16 ounces fresh fettuccine cooked according to package directions.


  • Preheat the oven to broil on high. Roast the peppers, skin side up under the broiler for 7-10 minutes or until skins are blackened all around. Remove from the oven and place peppers in a glass bowl and cover tightly with plastic wrap. Let the peppers steam for 30 minutes, then remove the skins with your fingers (they should slip right off) and chop.
  • Heat the olive oil in a large pan over medium-high heat, then sauté the onions in the olive oil until soft. Add the roasted peppers and roasted garlic with the cloves removed from the papery skin, and stir to combine and heat through.
  • Transfer the peppers, onions, and garlic to a blender or food processor and blend until smooth.
  • Melt the butter in the same pan. Pour the red pepper puree back into the pan with the butter and add the broth, cream, and a pinch of salt and pepper. Stir to combine, then taste and adjust seasonings as needed.
  • Remove pan from heat and stir in the Parmesan cheese.
  • Prepare the fettuccine according to package directions in salted water. Add the cooked pasta to the sauce and gently toss to coat.
  • Sprinkle with a little additional Parmesan cheese and basil strips and serve immediately.


  • You can use one 16-ounce jar of roasted red peppers from the store instead of roasting your own. Just drain thoroughly, then use in the recipe as written.
  • Two whole heads of garlic might seem like a lot, but roasting garlic really mellows the flavor and it won't be overpowering at all in this sauce. If you don't have time to roast the garlic, just mince up 4 garlic cloves and saute them in with the onions instead.


Calories: 514kcal | Carbohydrates: 64g | Protein: 16g | Fat: 22g | Saturated Fat: 10g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 8g | Trans Fat: 1g | Cholesterol: 108mg | Sodium: 334mg | Potassium: 464mg | Fiber: 5g | Sugar: 5g | Vitamin A: 3073IU | Vitamin C: 108mg | Calcium: 161mg | Iron: 2mg