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white oval casserole of spaghetti squash and tomato sauce with melted cheese on top and a sprig of basil

Spaghetti Squash Casserole


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5 from 2 reviews

  • Author: Lisa
  • Total Time: 1 hour 20 minutes
  • Yield: 4 generous main dish servings 1x
  • Diet: Vegetarian

Description

This easy Italian-style spaghetti squash casserole recipe is perfect for the weeknight dinner rotation - a healthy vegetarian meal that satisfies.


Ingredients

Units Scale
Equipment: a 2-quart casserole
  • 4 cups cooked spaghetti squash from 1 large - 3-lb. squash. Here's how to cook spaghetti squash
  • 2 tablespoon olive oil, divided
  • 1 large yellow onion, chopped
  • 3 large garlic cloves, minced or passed through a garlic press
  • 1 or 2 pinches of crushed red pepper flakes
  • A 6-ounce can of tomato paste
  • 1 teaspoon dried basil
  • 2 teaspoons onion powder
  • 1/2 teaspoon Kosher salt
  • Several grinds of black pepper
  • 1 cup shredded extra sharp cheddar cheese, divided

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Instructions

preheat oven to 375ºF/190ºC

  1. Put the cooked spaghetti squash into a large mixing bowl and set aside.
  2. Heat 1 tablespoon of the oil in a medium saucepan or in a skillet over medium heat and sauté the onion, garlic and red pepper flakes, stirring occasionally, until the onion is soft and starting to brown, about 5 minutes. Add the second tablespoon of oil and the tomato paste and cook for 1 minute, stirring constantly with a wooden spoon. Tomato paste will caramelize and darken in color, and some may stick to the pan. Remove pan from heat, add a tablespoon of water, and scrape the pan with a wooden spoon to release any stuck bits, and then transfer the tomato paste mixture to the bowl with the squash.
  3. Add the basil, onion powder, salt, pepper and half the cheese. Mix thoroughly, transfer to the casserole, top with remaining cheese, and bake for 40 minutes. Serve hot, with a salad on the side, if you like.
  • Prep Time: 10 min
  • Roasting the spaghetti squash: 30 min
  • Cook Time: 40 min
  • Category: Casserole
  • Method: Bake
  • Cuisine: Italian-style