Butternut Squash Casserole

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Warm, cozy, and full of comforting autumn flavors, this Butternut Squash Casserole is the kind of dish that turns ordinary dinners into something extra special. With sweet roasted butternut squash, caramelized onions, and a savory crumble topping, it’s both rich and wholesome—perfect for holidays, potlucks, or even a chilly weeknight meal.

The balance of sweetness from the butternut squash and the depth of flavor from browned butter, herbs, and crispy topping makes every bite crave-worthy. Whether you’re serving this as a vegetarian main or a hearty side dish, it’s guaranteed to impress your guests and satisfy your comfort food cravings.

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Why You’ll Love This Butternut Squash Casserole

This recipe brings together minimal prep with maximum flavor. The natural sweetness of the butternut squash caramelizes as it bakes, while the crumbly topping adds texture and that golden-brown finish we all love. It’s a crowd-pleaser, easy to make ahead, and totally customizable. Add nuts for crunch, or even a touch of maple syrup for extra depth.

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What Kind of Butternut Squash Should I Use?

Fresh, firm butternut squash works best for this casserole. Look for one with a long neck and small bulb, which makes peeling and cutting easier and yields more usable flesh. You can also use pre-cut cubes from the store if you’re short on time—just make sure they’re fresh and not overly moist. Avoid frozen squash for this dish, as it tends to release too much water and may lead to a soggy casserole.

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Ingredients for the Butternut Squash Casserole

To make this delicious casserole, you’ll need a handful of everyday ingredients that each play a vital role in flavor and texture:

• Butternut Squash – The sweet and nutty base of the casserole; it roasts beautifully and holds its shape.
• Yellow Onion – Adds a savory, caramelized layer that deepens the overall taste.
• Butter – Used for sautéing and in the crumble topping; it enhances richness and aroma.
• Brown Sugar – Balances the natural earthiness of the squash with a hint of sweetness.
• Breadcrumbs or Crushed Crackers – For that irresistible crunchy topping.
• Fresh Sage – Offers an earthy, woodsy flavor that pairs perfectly with squash.
• Salt & Pepper – To season and bring all the flavors together.
• Shredded Cheese (optional) – Adds a creamy, melty texture if you want an extra indulgent casserole.

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How To Make the Butternut Squash Casserole

Step 1: Roast the Squash

Preheat the oven to 400°F (200°C). Peel and cube the butternut squash into bite-sized pieces. Spread on a baking sheet, drizzle with olive oil, season with salt and pepper, and roast for 25–30 minutes until tender and lightly golden.

Step 2: Caramelize the Onions

While the squash is roasting, melt butter in a skillet over medium-low heat. Add sliced onions and cook slowly for 15–20 minutes until deep golden and caramelized.

Step 3: Make the Crumble Topping

In a small bowl, mix breadcrumbs or crushed crackers with melted butter, brown sugar, and chopped fresh sage. Set aside.

Step 4: Assemble the Casserole

In a large mixing bowl, combine the roasted squash and caramelized onions. If using cheese, fold it in now. Transfer mixture to a greased baking dish.

Step 5: Add the Topping and Bake

Sprinkle the crumble topping evenly over the casserole. Bake at 375°F (190°C) for 20–25 minutes, or until the topping is crisp and golden.

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Serving and Storing Butternut Squash Casserole

This cozy casserole serves about 6 people as a hearty side dish or 4 as a main course. It’s ideal for family dinners, fall gatherings, or as part of your holiday spread. You can prepare it ahead of time and reheat it just before serving, which makes it a convenient choice for busy days.

To store leftovers, let the casserole cool completely, then cover tightly and refrigerate for up to 4 days. Reheat in the oven at 350°F (175°C) until warmed through. You can also freeze it for up to a month; just wrap it well and thaw overnight in the fridge before reheating.

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What to Serve With Butternut Squash Casserole?

Herb Roasted Chicken

The mild, savory flavors of roasted chicken complement the sweetness of the squash perfectly.

Garlic Green Beans

A crisp and fresh side that balances the richness of the casserole.

Cranberry Sauce

Adds a tangy contrast that brightens the overall meal.

Wild Rice Pilaf

Earthy and nutty, it adds texture and depth to the table.

Maple Glazed Carrots

Bring out more natural sweetness for a harmonious flavor combo.

Kale Salad with Lemon Vinaigrette

Fresh greens add crunch and a zesty punch to lighten the meal.

Crusty Bread

Great for soaking up any delicious juices from the casserole.

Apple Cider or White Wine

A cozy drink pairing to round out a fall-inspired meal.

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Frequently Asked Questions

Can I make this casserole ahead of time?
Yes! You can prepare the casserole up to a day in advance. Assemble everything but don’t bake it until you’re ready. Cover tightly and refrigerate, then bake as directed when you’re ready to serve.

Can I make it vegan?
Absolutely. Swap butter for plant-based butter, skip the cheese or use vegan cheese, and ensure your topping is dairy-free. It will still be rich and flavorful.

Is there a substitute for sage?
If you don’t have fresh sage, try using dried sage (just reduce the amount), or substitute with thyme or rosemary for a slightly different flavor profile.

Can I use frozen butternut squash?
You can, but fresh is preferred. Frozen squash can be more watery and may change the texture of the final dish. If you do use it, be sure to roast it first to remove excess moisture.

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Save This Pin For Later

Save this recipe to your Pinterest side dish board so you can come back to it for holiday gatherings or cozy winter meals.
And let me know in the comments how yours turned out! Did you go cheesy or keep it classic? Did you add nuts or spice it up?
I love seeing all your takes on these comforting recipes. And if you’re looking for more ideas, be sure to follow along on Meals We Share By Sally on Pinterest for daily kitchen inspiration!

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Conclusion

Butternut Squash Casserole is a feel-good dish that brings warmth, texture, and depth of flavor to your table. It’s simple enough for everyday meals, yet special enough for holiday feasts. Whether you’re making it as a main or a side, this casserole brings a wholesome touch of seasonal comfort you’ll want to make again and again.

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