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Rich Winter Vegetable Casserole

A close-up serving of Rich Winter Vegetable Casserole featuring creamy sauce, chunks of carrots, and a golden, crunchy breadcrumb topping.

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A hearty, baked casserole featuring seasonal root vegetables in a creamy, savory sauce, perfect for a main dish or holiday side.

Ingredients

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  • 1 tbsp olive oil
  • 1 large onion, chopped
  • 2 cloves garlic, minced
  • 1 lb carrots, peeled and sliced
  • 1 lb parsnips, peeled and sliced
  • 1 small butternut squash, peeled, seeded, and cubed
  • 8 oz cremini mushrooms, sliced
  • 1/2 cup dry white wine or vegetable broth
  • 2 tbsp all-purpose flour
  • 2 cups vegetable broth
  • 1 cup heavy cream
  • 1/2 cup grated Parmesan cheese
  • 1 tsp dried thyme
  • 1/2 tsp salt
  • 1/4 tsp black pepper
  • 1 cup shredded Gruyère cheese (for topping)
  • 1/4 cup breadcrumbs (optional, for topping)

Instructions

  1. Preheat your oven to 375°F (190°C). Grease a 9×13 inch baking dish.
  2. Heat olive oil in a large skillet over medium heat. Add onion and cook until softened, about 5 minutes. Add garlic and cook for 1 minute more.
  3. Add carrots, parsnips, squash, and mushrooms to the skillet. Sauté for 8-10 minutes until vegetables begin to soften slightly.
  4. Pour in the white wine or broth and let it simmer for 2 minutes, scraping up any browned bits from the bottom of the pan.
  5. Sprinkle the flour over the vegetables and stir for 1 minute.
  6. Slowly whisk in the vegetable broth until the mixture thickens slightly. Stir in the heavy cream, Parmesan cheese, thyme, salt, and pepper. Cook until the sauce just begins to bubble.
  7. Pour the vegetable mixture into the prepared baking dish.
  8. In a small bowl, mix the Gruyère cheese and breadcrumbs, if using. Sprinkle the cheese mixture evenly over the top of the casserole.
  9. Bake for 30 to 35 minutes, or until the sauce is bubbly and the top is golden brown and crisp.
  10. Let the casserole rest for 10 minutes before serving.

Notes

  • For a deeper flavor, roast the root vegetables separately for 15 minutes before adding them to the sauce mixture.
  • You can substitute kale or spinach for mushrooms if you prefer greens. Add them in the last 5 minutes of the sauce simmering stage.
  • This casserole reheats well; cover it loosely with foil and bake at 350°F (175°C) until heated through.

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