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Easy Butternut Squash Casserole Recipe

4.4 from 86 reviews

This Easy Butternut Squash Casserole is a comforting and flavorful dish featuring tender butternut squash, cauliflower, and red onions combined with creamy celery soup and a blend of Parmesan and aged cheddar cheeses. Baked to bubbling perfection, it makes a delightful side or vegetarian main course that’s simple to prepare and perfect for any occasion.

Ingredients

Scale

Vegetables

  • 2 cups cauliflower florets
  • 2 cups butternut squash, cubed
  • 1/2 cup diced red onions

Seasonings and Cheese

  • 1 cup grated Parmesan cheese
  • 1 teaspoon sea salt
  • 1 teaspoon black pepper
  • 1 can celery soup (about 10.5 oz)
  • Aged cheddar cheese, for topping (about 1 cup grated)

Instructions

  1. Prepare the Vegetables: In a large bowl, combine 2 cups of cauliflower florets, 2 cups of cubed butternut squash, and 1/2 cup of diced red onions to create the vegetable base for the casserole.
  2. Add Cheese and Seasonings: To the vegetables, add 1 cup of grated Parmesan cheese along with 1 teaspoon each of sea salt and black pepper. This adds a rich, savory flavor and seasoning to the mix.
  3. Mix and Combine: Pour 1 can of celery soup into the bowl with the vegetables and cheese. Thoroughly mix all the ingredients together until everything is evenly coated and well combined.
  4. Assemble the Casserole: Transfer the mixture into a square baking dish, spreading it out evenly. Generously top with aged cheddar cheese according to your preference to add a creamy, melty topping.
  5. Bake the Casserole: Preheat your oven to 375°F (190°C). Place the casserole dish in the oven and bake for 25 minutes, or until the cheese is melted, bubbly, and the vegetables are tender when pierced with a fork.
  6. Serve and Enjoy: Remove the casserole from the oven carefully and let it cool for a few minutes. Serve warm as a comforting side dish or vegetarian entrée.

Notes

  • You can substitute the celery soup with a homemade cream of celery soup or a low-sodium canned version for a healthier option.
  • For extra texture, consider adding toasted bread crumbs sprinkled on top before baking.
  • This casserole can be prepared ahead of time and refrigerated before baking; just add a few extra minutes to the cooking time if baking from cold.
  • If you prefer a spicier twist, add a pinch of cayenne pepper or smoked paprika to the seasoning mix.
  • Leftovers keep well in the fridge for 3-4 days and can be reheated in the oven or microwave.

Keywords: butternut squash casserole, easy casserole, vegetarian casserole, baked vegetable dish, comfort food