As autumn casts its warm glow and the air fills with the scent of fallen leaves, I find myself yearning for comforting dishes that nourish both body and soul. That’s how I stumbled upon this Savory Butternut Squash Casserole with Parmesan-Creamed Kale. It’s a delightful twist on traditional comfort food that transforms humble ingredients into a stunning centerpiece for any gathering.

This casserole is a harmonious blend of creamy butternut squash and savory Parmesan-creamed kale, topped with a toasty walnut-sourdough crust that will make your taste buds dance. Whether you’re hosting a holiday feast or simply looking to elevate a weeknight dinner, this dish offers versatility, richness, and a lovely balance of flavors in every bite. Let me show you how to create this memorable dish that’s destined to become a favorite around your table!

Why is Butternut Squash Casserole a Must-Try?

Comforting Treat: This casserole is the ultimate cozy meal, blending smooth butternut squash and creamy kale in perfect harmony.

Crowd-Pleaser: Impress your guests with its irresistible flavor profile which is always a hit, making it perfect for any occasion.

Versatile Delight: Whether as a main or side dish, it complements both vegetarian and meat-centered meals beautifully.

Nutritious Indulgence: Packed with nutrient-dense ingredients, this dish nourishes while satisfying the heart and soul.

Easy Preparation: With simple steps and minimal prep, you can enjoy more time with loved ones on busy days.

Craving even more deliciousness? Don’t forget to check out my tips for making this dish in advance so you can spend less time in the kitchen and more time enjoying the festivities!

Butternut Squash Casserole Ingredients

For the Base
• Extra-Virgin Olive Oil – Adds fat for sautéing and flavor; substitute with melted butter if needed.
• Yellow Onion – Provides aromatic base flavor; shallots are a great alternative.
• Garlic Cloves – Enhances savory depth; adjust amount based on your taste preference.
• Crushed Red Pepper Flakes – Adds a touch of heat; modify to your desired spice level.
• Lacinato Kale – Offers nutritional benefits and texture; spinach or Swiss chard can be swapped.
• Heavy Cream – Contributes to rich creaminess; use half-and-half or a dairy-free alternative for lighter fare.
• Parmesan Cheese – Adds savory, umami flavors; feel free to substitute with Pecorino Romano.
• Dijon Mustard – Provides a mild tanginess; yellow mustard can be used for a gentler flavor.
• Fresh Thyme Leaves – Imparts delightful herbaceous notes; dried thyme is a suitable substitute in smaller amounts.
• Kosher Salt & Black Pepper – Essential for seasoning; adjust according to taste.

For the Main Ingredients
• Butternut Squash – The star of the dish, furnishing sweetness and structure; ensure it’s diced evenly for even cooking.
• Gruyere Cheese – Adds a luscious creaminess and nutty flavor; Gouda or Fontina are good alternatives.

For the Topping
• Sourdough Bread – Forms the crispy topping, delivering crunch; use any hearty bread if sourdough is unavailable.
• Chopped Walnuts – Adds delightful texture and nuttiness; pecans can work as a wonderful substitute.

This hearty Butternut Squash Casserole is not just a dish; it’s a celebration of flavors, destined to warm your heart and bring smiles to your table!

How to Make Butternut Squash Casserole

Preheat your oven to 425°F (220°C) to prepare it for baking. A hot oven is essential for achieving that beautifully cooked casserole.
Sauté the yellow onion in 2 tablespoons of extra-virgin olive oil over medium heat for 7-8 minutes. Cook until it becomes soft and translucent, then stir in the garlic and crushed red pepper flakes; cook for an additional 2 minutes until fragrant.
Stir in the Lacinato kale and cook for 2-3 minutes until it wilts down; then, pour in the heavy cream, 1/3 cup of Parmesan cheese, Dijon mustard, fresh thyme, a sprinkle of kosher salt, and black pepper. Simmer for 3-5 minutes until the mixture thickens slightly.
Arrange the cubed butternut squash in a greased baking dish, making sure it’s evenly distributed. Top it with the creamy kale mixture, and sprinkle the Gruyere cheese generously on top.
Cover the dish with aluminum foil and bake for 30 minutes. Check the squash for tenderness midway—if it’s not soft, bake for an additional 10 minutes.
Combine any remaining sourdough bread, chopped walnuts, olive oil, and a pinch of salt in a bowl; mix until everything is coated well. This will form the delicious topping.
Uncover the casserole, add the crunchy topping, and return it to the oven uncovered for 20 minutes until the top is golden brown and the filling thickens, indicating it’s perfectly baked.
Let the casserole stand for 5-10 minutes before serving. This helps the flavors meld beautifully and makes it easier to serve.

Optional: Drizzle with a little extra olive oil before serving for added richness.

Exact quantities are listed in the recipe card below.

How to Store and Freeze Butternut Squash Casserole

Fridge: Store leftovers in an airtight container for up to 5 days. Ensure it’s well-covered to maintain its creamy texture and flavor.
Make-Ahead: Prep the butternut squash up to 3 days in advance, and chop the kale 1 day ahead for convenience and easy assembly.
Freezer: To freeze, ensure your casserole is in an airtight container or wrapped tightly in foil and freeze for up to 3 months. Thaw overnight in the fridge before reheating.
Reheating: When ready to eat, reheat the casserole at 350°F (175°C) until heated through, about 20-30 minutes, until creamy and delicious once more.

Butternut Squash Casserole Variations

Looking to add your own flair to this stunning dish? Dive into these delightful spins to enhance the flavors and textures!

Protein-Packed: Stir in cooked sausage or chicken for a heartier casserole that satisfies meat lovers.
Sweet Potato Swap: Substitute butternut squash with sweet potatoes for a slightly sweeter and vibrant alternative.
Cheesy Blend: Mix different cheeses, such as Fontina or a sharp cheddar, for a unique twist on flavor.
Spice Level Up: Add chopped jalapeños or a dash of cayenne pepper for an unexpected kick to your casserole.
Herb Infusion: Sprinkle in fresh sage or rosemary to elevate the aroma and add a rustic touch that pairs beautifully with the squash.
Nutty Crunch: Toast some pecans alongside walnuts for added depth and a unique flavor profile in your topping.
Vegan Delight: Swap heavy cream with coconut milk and cheese with a plant-based variant to enjoy a delicious vegan version.
Crispy Topping: Experiment with crushed potato chips instead of sourdough for an irresistibly crunchy every bite!

What to Serve with Butternut Squash Casserole?

As you dive into the creamy, flavorful layers of this dish, imagine pairing it with vibrant sides and delightful treats that will enhance your meal gathering experience.

Crispy Brussels Sprouts: Their nutty flavor and crisp texture create a mouthwatering contrast to the creamy casserole.
Savory Garlic Bread: This warm, crusty option offers a satisfying crunch and therapy for sopping up the delicious casserole.
Tangy Cranberry Sauce: The tartness brightens each bite, perfectly balancing the rich flavors of the dish.
Roasted Root Vegetables: The caramelized sweetness of carrots and parsnips complements butternut squash beautifully for an earthy mix.
Simple Green Salad: A fresh salad with mixed greens and light vinaigrette provides a crisp, refreshing contrast to the richness of the casserole.
Autumn-Spiced Apple Cider: This warm, spiced drink harmonizes with the comforting tones of the casserole, bringing warmth to your gathering.
Pumpkin Cheesecake: For dessert, indulge in this creamy treat that echoes the flavors of fall, making for a sweet ending.
Apple Crisp: The warm, cinnamon-sugar topping pairs perfectly with creamy textures, providing a delightful crunch that rounds out the meal.

Each of these pairings not only complements the irresistible flavors of the Butternut Squash Casserole but also turns your meal into a cozy, memorable feast.

Expert Tips for Butternut Squash Casserole

Optimal Creaminess: Cover the casserole with foil during the initial baking to lock in moisture and ensure a creamy texture throughout.
Texture Check: To avoid overcooking, gently check the tenderness of the butternut squash halfway through baking to determine if additional time is needed.
Even Browning: Massage the olive oil into the topping mixture; this technique promotes even browning and a delightful crunch in your butternut squash casserole.
Protein Boost: For those who enjoy a heartier dish, consider adding browned Italian sausage or chicken sausage to enhance flavor and protein content.
Ingredient Substitution: Don’t hesitate to experiment! You can swap in sweet potatoes for the butternut squash or different types of cheese based on what you have on hand.

Make Ahead Options

These Butternut Squash Casserole components are perfect for meal prep, allowing you to enjoy cooking while saving precious time! You can prep the butternut squash up to 3 days in advance by dicing it and storing it in an airtight container in the refrigerator. The kale can be chopped 1 day ahead, keeping it fresh for cooking. On the day you plan to serve, simply layer the prepped ingredients in the dish, finish assembling with the creamy mixture, and bake as directed. This method not only saves you time but preserves the flavors and textures, ensuring it’s just as delicious when you’re ready to enjoy your comforting casserole!

Butternut Squash Casserole Recipe FAQs

What is the best way to select a ripe butternut squash?
When choosing butternut squash, look for ones that feel heavy for their size and have a smooth, firm skin. Avoid any with dark spots or significant blemishes, as these can indicate decay. Ideally, the skin should be a deep beige-orange hue without any green patches.

How should I store leftovers of the butternut squash casserole?
To keep your leftovers fresh, transfer them to an airtight container and refrigerate for up to 5 days. Make sure to cover it well to prevent drying out and to retain all that scrumptious creaminess.

Can I freeze butternut squash casserole?
Absolutely! To freeze, first let the casserole cool completely, then transfer it to an airtight container or wrap it tightly with aluminum foil. It can be frozen for up to 3 months. When you’re ready to enjoy it again, simply thaw it overnight in the refrigerator and reheat in the oven at 350°F (175°C) for 20-30 minutes until heated through.

What should I do if my casserole is too watery?
If you find your butternut squash casserole is too watery after baking, you can thicken it by returning it to the oven uncovered. Bake it at 350°F (175°C) for an additional 10-15 minutes to allow excess moisture to evaporate, resulting in a creamier texture.

How can I adapt the recipe for dietary restrictions or allergies?
For dairy-free options, substitute heavy cream with coconut cream or a plant-based creamer. You can also replace the cheeses with nut-based cheese alternatives. Additionally, check for gluten sensitivities by using gluten-free bread in place of sourdough for the topping.

Is it safe for pets to eat butternut squash?
Yes, butternut squash is safe for dogs and cats in moderation! It’s high in fiber and vitamins but should be served plain and cooked. Just be sure not to add any seasonings or toppings that may upset their stomachs.