Butternut Squash Casserole Recipe

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Butternut squash casserole baked until golden and creamy

Butternut squash casserole is a simple, creamy bake with a crisp, buttery topping. It works as a holiday side dish or an easy plant-forward dinner with salad and bread.

This butternut squash casserole recipe uses tender roasted squash, a light creamy binder, warm seasoning, and a golden crumb topping. The method below gives exact amounts, clear timing, and doneness cues so you can make it on the first try.

Butternut Squash Casserole Ingredients and Preparation

For one 9×13-inch casserole, gather:

  • 1 large butternut squash, about 3 pounds, peeled, seeded, and cut into 1-inch cubes
  • 2 tablespoons olive oil
  • 1 teaspoon kosher salt, plus more to taste
  • 1/2 teaspoon black pepper
  • 1/2 teaspoon ground cinnamon
  • 1/4 teaspoon ground nutmeg
  • 1 small yellow onion, finely chopped
  • 2 cloves garlic, minced
  • 2 tablespoons butter or olive oil
  • 1/2 cup milk or unsweetened plain oat milk
  • 1/2 cup sour cream or plain Greek yogurt
  • 2 large eggs, lightly beaten
  • 1/2 cup grated Parmesan or sharp cheddar
  • 1/2 cup breadcrumbs
  • 2 tablespoons melted butter or olive oil, for the topping
  • 2 tablespoons chopped parsley or sage, optional

If you want a sweeter butternut casserole, add 1 to 2 tablespoons maple syrup. For a more savory version, keep it unsweetened and add extra herbs.

Start by heating the oven to 400°F. Line a sheet pan with parchment if you plan to roast the squash first. Grease the casserole dish lightly.

Roasting the squash gives the best texture and flavor. It also helps prevent a watery casserole. Toss the cubes with olive oil, salt, pepper, cinnamon, and nutmeg.

Make Butternut Squash Casserole

  1. Roast the squash. Spread it on the sheet pan in a single layer. Roast for 25 to 30 minutes, turning once, until the cubes are tender and lightly browned at the edges.
  2. Cook the aromatics. While the squash roasts, melt butter or warm oil in a skillet over medium heat. Add onion and cook for 5 to 7 minutes, until softened. Add garlic and cook for 30 seconds more.
  3. Mix the base. In a large bowl, combine the roasted squash, onion mixture, milk, sour cream or yogurt, eggs, and cheese. Stir gently so some squash stays slightly chunky.
  4. Check seasoning. Taste and add more salt or pepper if needed. If you want the butternut squash casserole sweeter, stir in maple syrup now.
  5. Assemble the casserole. Spread the mixture into the prepared baking dish.
  6. Make the topping. Combine breadcrumbs with melted butter or oil and parsley or sage. Sprinkle evenly over the top.
  7. Bake. Reduce the oven to 375°F and bake for 20 to 25 minutes, until the center is hot and the topping is golden.

The casserole is done when the edges are bubbling and the center reaches a hot, set consistency. A knife inserted in the middle should come out hot, not wet. If the top browns too quickly, cover it loosely with foil for the last 10 minutes.

Failure cue: if the casserole looks loose and sloshy after baking, it usually needs more time or the squash held too much moisture. Let it rest for 10 minutes before serving so it firms up.

Serve, Store, or Vary Butternut Squash Casserole

Serve this butternut squash casserole hot, after a 10-minute rest. It pairs well with roasted chicken, turkey, beans, lentils, or a simple green salad. For a fuller vegetarian meal, add toasted nuts and crusty bread on the side.

For a holiday-style finish, top it with extra herbs or a little more Parmesan after baking. For a softer, more spoonable casserole, stir in an extra 1/4 cup milk before baking. For a richer butternut squash casserole recipe, use heavy cream instead of milk.

To make ahead, assemble the casserole up to 1 day in advance without the breadcrumb topping. Cover and refrigerate. Add the topping just before baking. If baking straight from the fridge, add 5 to 10 minutes to the oven time.

Store leftovers covered in the refrigerator for up to 4 days. Reheat in a 350°F oven until hot, about 15 to 20 minutes for a full pan, or warm single portions in the microwave. The topping will soften in storage, but the flavor stays strong.

You can freeze baked butternut casserole for up to 2 months. Cool it completely, wrap it well, and thaw overnight in the refrigerator before reheating. For the best texture, freeze without the topping and add fresh crumbs after thawing.

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