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Butternut Squash Pasta Sauce

Butternut squash pasta sauce made silky-smooth with an immersion blender and simmered until the squash turns tender. This Italian-American sauce clings to rigatoni with creamy Parmesan and a warm nutmeg kick, finished with sage and red pepper flakes.
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Prep Time 15 minutes
Cook Time 35 minutes
Total Time 50 minutes
Servings: 4 servings
Course: Main Dish
Cuisine: Italian-American
Calories: 640
Ingredients Equipment Method Notes

Ingredients
  

Rigatoni or penne
  • 1 lb rigatoni or penne Cook until al dente; reserve pasta water for thinning.
Butternut squash base
  • 1 small butternut squash, peeled and cubed About 4 cups cubed, very tender after simmering.
  • 1 onion, diced Sauté until softened.
  • 4 cloves garlic, minced Add after onion to prevent burning.
  • 3 cup vegetable or chicken broth Use enough to simmer the squash until very tender.
  • 2 tbsp olive oil For sautéing aromatics.
  • 1 tbsp fresh sage, chopped Add early with garlic for fragrance.
  • 1 tsp nutmeg Warm spice; adjust to taste.
  • 0.25 tsp red pepper flakes Use for gentle heat.
  • 0.5 cup heavy cream Stir in after blending for a creamy finish.
  • 0.5 cup parmesan, grated Add after cream; simmer until smooth.
  • 0.5 cup pasta water Use as needed to loosen sauce and help it cling to pasta.
  • salt and pepper to taste Season in the final step and adjust as needed.

Equipment

  • 1 Dutch oven
  • 1 Immersion blender

Method
 

Sauté aromatics
  1. Heat the olive oil in a large pot over medium heat, then sauté the onion for 5 minutes until softened and translucent. Stir occasionally so the onions don’t brown.
  2. Add the garlic and chopped sage, then cook for 2 minutes until fragrant. Keep the heat at a steady simmering pace so garlic stays sweet, not scorched.
Simmer squash
  1. Add the cubed butternut squash and the broth, then bring to a boil. Once boiling, reduce to a simmer and cook for 20 minutes until the squash is very tender and easily pierced.
Blend smooth
  1. Blend the mixture completely smooth using an immersion blender. Blend until no squash chunks remain and the sauce looks uniformly silky and golden-orange.
Finish sauce
  1. Stir in the heavy cream, grated parmesan, nutmeg, and red pepper flakes, then simmer for 5 minutes. Stir often so the parmesan melts smoothly and the sauce thickens slightly without separating.
Toss pasta and season
  1. Cook the rigatoni or penne until al dente, then add it to the sauce. Toss thoroughly, adding pasta water as needed to loosen the sauce so it coats the pasta.
  2. Season with salt and pepper to taste. Taste right before serving and adjust for balance between sweet squash, savory parmesan, and heat from flakes.

Notes

Pro tip: Blend while the mixture is hot for the smoothest texture—then simmer briefly after adding cream to bring everything together. Store leftovers in the fridge up to 3 days; reheat gently on the stovetop with a splash of pasta water or broth. Freezing is not recommended because cream-based sauces can separate after thawing. For a dairy-light swap, replace heavy cream with canned evaporated milk and use a bit less parmesan or a dairy-free parmesan alternative (texture stays creamy, flavor slightly changes).