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The squash cubes soften and pick up browned edges in the oven, and that roasting step gives this casserole a sweeter, more concentrated base than a pot of boiled squash would. I like that it doesn’t ask for a perfectly smooth puree, either. A few soft pieces give the filling a little body beneath the buttery pecan topping.

For this butternut squash casserole, the squash gets mashed while it’s still warm, then cooled briefly before the eggs go in. That short pause keeps the filling from feeling rushed and gives you time to whisk the sugar, milk, vanilla, and salt together separately. Spread the filling into an 8-inch square dish, scatter on the clumpy topping, and the oven takes it from there: tender squash underneath, golden pecans on top.

Why This Casserole Shouldn’t Be Mashed Until It’s Completely Smooth

A silky puree sounds appealing, but taking the squash all the way to a uniform paste changes the character of this dish. The filling is meant to be soft and spoonable, with a little texture from the roasted squash beneath the crisp topping. Mash it until most of the larger pieces are gone, then stop when it still looks like squash rather than a perfectly smooth custard.

That texture also helps the topping earn its place. The buttery pecan crumble stays distinct on top, while the filling remains tender instead of turning into one even, pudding-like layer. A potato masher makes it easy to stop at the right point; press and turn through the bowl, checking as you go rather than beating continuously. If a few small pieces remain, that’s exactly the sort of variation that makes each spoonful feel homemade. The eggs and milk bring the filling together during baking, so there’s no need to work the squash into a puree before you add them.

What the Squash, Eggs, and Pecans Each Bring to the Dish

• Butternut squash — Choose a firm squash that feels heavy for its size, with no soft spots. The cubes roast more evenly when they’re close to the same size, and peeled, seeded squash saves a good deal of prep; fresh squash is what gives this filling its roasted sweetness and texture.
• Eggs and whole milk — The eggs help the squash mixture set into a cohesive casserole, while the milk softens the texture and adds richness. Large eggs matter here because the filling relies on them for structure. Lower-fat milk works in a pinch, though the finished filling won’t be quite as rich; a direct egg swap is harder to recommend because it changes how firmly the casserole sets.
• Unsalted butter — Butter enriches both the squash and the crumb topping, and using unsalted butter lets the measured kosher salt season the filling without guesswork. A good everyday butter is fine; there’s no need for a specialty brand. For a dairy-free version, use an unsalted plant-based butter and unsweetened oat milk, knowing the filling and topping will taste a little less buttery.
• Granulated sugar, brown sugar, and vanilla — Granulated sugar sweetens the squash without adding extra moisture, while brown sugar helps the topping form tender, caramel-like clusters. The vanilla rounds out the squash’s earthy sweetness. Use fresh brown sugar that isn’t dried into a hard lump so it mixes evenly with the flour and butter.
• Flour and pecans — All-purpose flour gives the topping its crumbly structure, and chopped pecans add a toasted, buttery crunch. Ordinary all-purpose flour works well here; for a gluten-free adaptation, use a cup-for-cup baking blend made to replace wheat flour. Fresh pecans are worth choosing if yours have been open a long time, since stale nuts can taste flat.

Roast, Mash, and Bake Without Losing the Squash’s Texture

Roast the cubes until fork-tender

Heat the oven to 400°F and toss the squash cubes with olive oil on a rimmed 18×13-inch baking sheet. Spread them out so they roast rather than crowd together, then bake for 25 to 35 minutes, stirring once. They’re ready when a fork slides into a cube easily; if the centers still resist, give them a little more time. Transfer the squash to a large bowl while it’s hot.

Mash and give the squash a short cool-down

Mash the warm squash until it’s mostly smooth, stopping while a little texture remains. Let it cool for 10 minutes before adding the egg mixture. That brief cooling period makes the squash easier to handle and keeps you from combining the eggs with squash straight from the oven. While it rests, reduce the oven temperature to 350°F and grease an 8-inch square baking dish with cooking spray.

Make the filling and clumpy pecan topping

Stir 4 tablespoons of melted butter into the mashed squash. In a separate medium bowl, whisk the granulated sugar, eggs, whole milk, vanilla, and kosher salt until combined, then stir that mixture into the squash. In another medium bowl, mix the flour, packed light brown sugar, chopped pecans, and the remaining melted butter until evenly moistened and clumpy. If flour is still sitting dry at the bottom, keep stirring until the crumbs hold together in small clusters.

Layer the casserole and bake until golden

Spread the squash mixture evenly in the greased dish, then scatter the topping across it so there are pecans in every portion. Bake at 350°F for 30 to 35 minutes, until the topping is golden and the center reaches 160°F. The top should look toasted, not pale, and the filling should be set rather than liquid in the middle. Let the casserole rest for 10 minutes before serving so it settles and is easier to scoop.

Three Simple Ways to Change the Topping

The Questions That Come Up Before This Casserole Goes in the Oven

Butternut Squash Casserole

Butternut squash casserole is made with roasted squash mashed until mostly smooth, then baked under a golden pecan topping. A sweet, tender filling and crunchy topping make this a comforting American side dish.

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Prep Time 20 minutes mins

Cook Time 1 hour hr 5 minutes mins

Resting 10 minutes mins

Total Time 1 hour hr 35 minutes mins

Servings: 8 servings

Course: Side Dish

Cuisine: American

Calories: 320

Ingredients Equipment Method Notes

Ingredients

  

For the filling

• 1 tbsp olive oil
• 3 lb butternut squash peeled, seeded, cut into 1-inch cubes
• 1 nonstick cooking spray for greasing
• 8 tbsp unsalted butter melted and divided (4 tablespoons for the filling and 4 tablespoons for the topping)
• 0.5 cup granulated sugar
• 2 eggs large
• 0.25 cup whole milk
• 1 tsp vanilla extract
• 0.5 tsp kosher salt

For the topping

• 0.5 cup all-purpose flour
• 0.33 cup brown sugar packed, light
• 0.5 cup pecans chopped

Equipment

• 1 rimmed 18x13-inch baking sheet
• 1 8-inch square baking dish

Method

 

Roast the squash

1. Heat the oven to 400°F.
2. Toss the squash with the olive oil and spread it on a rimmed 18x13-inch baking sheet.
3. Roast for 25 to 35 minutes, stirring once, until fork-tender.
4. Transfer the squash to a large bowl and mash until mostly smooth.
5. Let it cool for 10 minutes.

Make the filling

1. Reduce the oven temperature to 350°F.
2. Grease an 8-inch square baking dish with nonstick cooking spray.
3. Stir 4 tablespoons of the melted butter into the squash.
4. In a medium bowl, whisk the granulated sugar, eggs, milk, vanilla, and salt.
5. Stir the mixture into the squash until combined.

Make the topping

1. Stir the flour, brown sugar, pecans, and remaining 4 tablespoons melted butter in a medium bowl until evenly moistened and clumpy.

Bake the casserole

1. Spread the squash mixture in the prepared dish.
2. Scatter the topping evenly over it.
3. Bake for 30 to 35 minutes, until the topping is golden and the center reaches 160°F.
4. Let the casserole rest for 10 minutes before serving.

Notes

For an evenly textured filling, mash the squash until mostly smooth while it is still warm. Refrigerate leftovers for 3 to 4 days; freeze for up to 2 months. For a dairy-free version, use dairy-free butter and milk.