Cheesy butternut squash casserole topped with crispy breadcrumbs and fresh thyme, served in a red Staub dish with a hint of melted cheese, kale, and butternut squash.

Cheesy Butternut Squash Casserole

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When it comes to festive side dishes, this Cheesy Butternut Squash Casserole takes the spotlight. A rich, creamy blend of sweet butternut squash, savory cheese, and crispy walnut-sourdough topping makes this casserole a crowd favorite. Whether you’re preparing a cozy holiday dinner or just craving something seasonal, this casserole is sure to impress.

A golden, crispy bread-topped casserole filled with butternut squash, kale, and leeks in a red Staub dish, garnished with fresh thyme.

Table of contents

Why You’ll Love This Cheesy Butternut Squash Casserole

This dish offers the perfect balance of flavors—sweet, savory, herby, and creamy—all in one bite. It features nutrient-packed kale, hearty butternut squash, and a generous amount of Gruyere and Parmesan cheeses. The walnut-sourdough topping adds a delightful crunch, while fresh thyme and Dijon mustard tie everything together. It’s the ultimate side dish to elevate any holiday meal.

The Ingredients for This Perfect Cheesy Butternut Squash Casserole

Here’s what you’ll need:

  • Butternut Squash: 2 lbs. peeled and cubed, for a sweet, nutty base.
  • Kale: Sautéed for a tender, earthy texture.
  • Onion and Garlic: Sautéed together for aromatic depth.
  • Heavy Cream: To create a rich, creamy filling.
  • Cheese: A mix of Parmesan and Gruyere for the perfect flavor balance.
  • Sourdough Bread and Walnuts: For a crispy, crunchy topping that adds texture.
  • Dijon Mustard and Fresh Thyme: For an aromatic, herby flavor.
A close-up view of a casserole dish filled with roasted butternut squash, kale, and a crispy bread crumb topping, garnished with fresh thyme and a golden spoon resting on the side.

How to Make Cheesy Butternut Squash Casserole

Step 1: Sauté the Aromatics

Start by preheating the oven to 425°F. Sauté the onion in olive oil until soft, then add garlic and red pepper flakes. Cook for an additional 2 minutes for a fragrant base.

Step 2: Add Kale and Cream

Stir in the kale and let it wilt. Add the heavy cream, Parmesan, Dijon mustard, thyme, and season with salt and pepper. Simmer until thickened, about 5 minutes.

Step 3: Assemble and Bake the Casserole

Layer the cubed butternut squash in a greased baking dish. Pour the kale mixture over the squash, stirring to coat. Sprinkle Gruyere cheese on top, then bake at 425°F for 30 minutes.

Step 4: Prepare the Topping

While the casserole bakes, combine torn sourdough, walnuts, Parmesan, and olive oil. Massage the oil into the bread mixture. After 30 minutes, remove the foil from the casserole and top with the sourdough mixture. Bake uncovered for 20 more minutes, and broil for 1-2 minutes for a golden, crispy crust.

How to Cut Butternut Squash Like a Pro

Cutting butternut squash can be tricky, but with a sharp knife and a steady hand, it’s manageable. Follow these easy steps to peel and cube the squash with confidence:

  • Slice off both ends and peel with a vegetable peeler.
  • Cut the squash in half, scoop out seeds, and slice into 1-inch slabs, then cube.

Storage and Make-Ahead Tips

  • Make-Ahead: Peel and cube the squash up to 3 days in advance. Chop the kale a day ahead.
  • Storing: Leftover casserole keeps for up to 5 days in the fridge.
  • Freezing: Freeze leftovers in an airtight container for up to 3 months. Let thaw in the fridge before reheating.

FAQs About Cheesy Butternut Squash Casserole

Can I add meat to this casserole?

Yes! Crumbled Italian sausage or chicken sausage can make this a hearty main dish.

How can I make this recipe dairy-free?

Use cashew cream or full-fat coconut milk and a dairy-free cheese alternative.

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Cheesy butternut squash casserole topped with crispy breadcrumbs and fresh thyme, served in a red Staub dish with a hint of melted cheese, kale, and butternut squash.

Cheesy Butternut Squash Casserole

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  • Author: Jake
  • Total Time: 1 hour 10 minutes
  • Yield: 8 servings
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Description

This Cheesy Butternut Squash Casserole is a savory delight featuring sweet butternut squash, nutrient-packed kale, savory cheese, and a crispy walnut-sourdough topping. It’s the perfect balance of flavors to elevate any holiday table or cozy meal.

Ingredients

Units Scale
  • 2 lbs. Butternut Squash, peeled and cubed
  • 1 bunch Kale, sautéed
  • 1 Onion, diced
  • 3 cloves Garlic, minced
  • 1 cup Heavy Cream
  • 1/2 cup Parmesan Cheese, grated
  • 1 cup Gruyere Cheese, grated
  • 1/2 cup Sourdough Bread, torn
  • 1/2 cup Walnuts, chopped
  • 1 tsp Dijon Mustard
  • 1 tbsp Fresh Thyme
  • Salt and Pepper, to taste
  • Red Pepper Flakes, to taste
  • Olive Oil

Instructions

  1. Preheat the oven to 425°F.
  2. Sauté the onion in olive oil until soft, then add garlic and red pepper flakes. Cook for an additional 2 minutes for a fragrant base.
  3. Stir in the kale and let it wilt. Add the heavy cream, Parmesan, Dijon mustard, thyme, and season with salt and pepper. Simmer for about 5 minutes until thickened.
  4. Layer the cubed butternut squash in a greased baking dish. Pour the kale mixture over the squash, stirring to coat. Sprinkle Gruyere cheese on top and bake for 30 minutes.
  5. While the casserole bakes, combine torn sourdough, walnuts, Parmesan, and olive oil. Massage the oil into the bread mixture.
  6. After 30 minutes, remove the foil from the casserole and top with the sourdough mixture. Bake uncovered for an additional 20 minutes. Broil for 1-2 minutes for a golden, crispy crust.

Equipment

Notes

Make sure to chop the kale finely and keep an eye on the casserole during broiling for the perfect crispy topping.

  • Prep Time: 20 minutes
  • Cook Time: 50 minutes
  • Category: Side Dish
  • Method: Baking
  • Cuisine: American

Nutrition

  • Serving Size: 1 serving
  • Calories: 350
  • Sugar: 9g
  • Sodium: 300mg
  • Fat: 22g
  • Saturated Fat: 10g
  • Unsaturated Fat: 10g
  • Trans Fat: 0g
  • Carbohydrates: 28g
  • Fiber: 6g
  • Protein: 8g
  • Cholesterol: 40mg

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Close-up view of a cheesy butternut squash casserole with crispy breadcrumbs, roasted squash, kale, and fresh thyme, served in a red Staub dish.

Final thoughts

This Cheesy Butternut Squash Casserole is not just a side dish; it’s a centerpiece that will steal the show at your next gathering. Whether you’re celebrating Thanksgiving or simply craving a cozy fall meal, this casserole is a perfect choice. Don’t forget to check out more holiday casserole recipes and bring warmth to your table!

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