Bity
This butternut squash casserole is the side dish that quietly steals the show on my holiday table: a soft, lightly sweet mash scented with cinnamon and vanilla, hidden under a buttery brown sugar and pecan crumble. It tastes like the cosy cousin of sweet potato casserole, only lighter and a little more grown up.
I first made it one November when the shop had sold out of sweet potatoes and I came home with a squash the size of a bowling pin instead. Honestly, nobody at the table missed the potatoes. Since then it has earned a permanent place beside the turkey, and because the filling is simply boiled, mashed and stirred, it is one of the easiest things I cook all season.
In short, butternut squash casserole is boiled, mashed squash mixed with butter, eggs, brown sugar, milk, vanilla and cinnamon, then baked at 350°F (180°C) under a brown sugar and pecan crumble. It takes 65 minutes in total, serves 8 and works out at about 380 calories per serving.
Quick Breakdown
Why You’ll Love This Butternut Squash Casserole
- Simple method. You boil the squash, mash it, stir in a few fridge staples and bake. There is no roasting, no blender and no fuss.
- Two textures in one spoonful. The base is silky and custardy, while the pecan crumble on top bakes crisp and golden.
- Gently sweet, not pudding sweet. Because squash is milder than sweet potato, the brown sugar and cinnamon lift it without making it taste like dessert.
- Feeds a crowd. One 2-quart dish serves eight as a side, so it suits Thanksgiving, Christmas and Sunday roasts alike.
- Make-ahead friendly. In fact, both the filling and the topping can be prepared the day before and kept apart until you bake.
Ingredient Notes
- Butternut squash. 3 pounds (about 1.4 kg), peeled and cubed. That is one large squash or two small ones. Cut the cubes to roughly the same size so they soften at the same pace.
- Butter. 4 tablespoons melted for the filling, plus 4 tablespoons cold and cubed for the crumble. Keep the second lot in the fridge until the last moment.
- Eggs. 2 large, beaten. They set the mash so it slices and scoops neatly instead of slumping.
- Brown sugar. 1/2 cup in the filling and another 1/2 cup in the topping. Light or dark both work; dark gives a deeper, more toffee-like flavour.
- Milk. 1/4 cup (60 ml), which loosens the mash just enough.
- Vanilla, cinnamon and salt. 1 teaspoon vanilla extract, 1/2 teaspoon cinnamon and 1/2 teaspoon salt. The salt matters, because it stops the dish tasting flat.
- All-purpose flour. 1/2 cup (plain flour in the UK), which binds the crumble.
- Pecans. 1/2 cup, chopped. They toast as the dish bakes, so there is no need to toast them first.
The squash in this butternut squash casserole is also doing you some good under all that crumble. According to the Tufts Health and Nutrition Letter, a cup of cooked butternut squash supplies fibre along with a generous dose of vitamin A, so this is one holiday side with a little substance behind it.
Is Butternut Squash Casserole Sweet or Savoury?
This version is sweet, in the classic Southern holiday style, although you will find both styles. Savoury versions lean on cheese, onions and breadcrumbs, whereas the classic Southern holiday version, which is the one I am sharing here, is sweet. It sits on the dinner plate next to the meat and gravy in the same way cranberry sauce does, giving every forkful a little contrast.
That said, my butternut squash casserole is restrained. With 1/2 cup of sugar in a filling made from three pounds of squash, the vegetable still tastes like itself. If you prefer it sweeter still, a handful of mini marshmallows over the crumble for the final five minutes is a popular touch.
Boiled, Roasted or Frozen Squash: Which Works Best?
Boiled cubes work best for this recipe. I boil them because it is quick and gives the smoothest mash. However, each method has its place, so here is how they compare.
| Method | Time | Result | Good to know |
|---|---|---|---|
| Boiled cubes (this recipe) | 15 to 20 minutes | Very soft, easy to mash smooth | Drain thoroughly, or the filling turns loose |
| Roasted halves | About 45 to 60 minutes | Drier flesh, deeper caramel flavour | No peeling needed; scoop the flesh out |
| Frozen cubes | Cook from frozen until tender | Softer and wetter | Drain well and let the steam escape before mashing |
How To Make Butternut Squash Casserole
Make the Filling
1. Heat the oven and boil the squash. First, preheat the oven to 350°F (180°C) and grease a 2-quart baking dish. Put the cubed squash in a large pot, cover it with water and bring it to a boil. Cook for 15 to 20 minutes, until a knife slides through a cube with no resistance at all.
2. Drain it properly. Next, tip the squash into a colander and leave it for a couple of minutes so the steam can carry off the extra moisture. This small pause is the difference between a filling that sets and one that weeps.
3. Mash until smooth. Then move the squash to a large bowl and work it with a potato masher until no lumps remain.
4. Stir in the rest. After that, add the melted butter, beaten eggs, brown sugar, milk, vanilla, cinnamon and salt. Stir until the mixture is one even, glossy orange. Spread it into the greased dish and level the top.
Add the Pecan Crumble and Bake
5. Rub in the butter. In a medium bowl, combine the flour and brown sugar. Add the cold cubed butter and cut it in with a fork or a pastry blender until the mixture looks like damp, clumpy sand.
6. Add the pecans. Stir the chopped nuts through the crumble, then scatter it evenly over the filling, right to the edges.
7. Bake. Bake for 30 to 35 minutes, until the topping is golden brown and the centre no longer wobbles when you nudge the dish.
8. Rest. Finally, let it stand for 10 minutes before serving. As it cools slightly the filling firms up, so you get clean spoonfuls.
Why Is My Casserole Watery?
A watery squash casserole is almost always caused by squash that was not drained well enough. Underbaking and skipping the 10 minute rest are the next most likely reasons:
- The squash was not drained enough. This is the usual culprit. Let it steam dry in the colander, and if it still looks wet, return it to the hot empty pot for a minute.
- It needed longer in the oven. The eggs have to set. If the middle still ripples, give it another five minutes.
- It was served straight away. The 10 minute rest is not optional, because the filling thickens as it stands.
- The topping melted into a sheet. Warm butter does that. Use butter straight from the fridge and stop mixing while you can still see small lumps.
Tips for the Best Butternut Squash Casserole
- Peel the squash with a sharp swivel peeler and trim both ends first so it sits flat on the board. It is far safer than wrestling a rolling squash.
- Let the mash cool for a few minutes before the eggs go in, so they blend smoothly rather than scrambling.
- Taste the filling before adding the eggs. Squash varies in sweetness, and a pinch more salt or cinnamon is easy to add at this point.
- For a silkier texture, beat the mash with an electric hand mixer for 30 seconds.
- If the pecans are browning too fast, lay a loose sheet of foil over the dish for the last 10 minutes.
Can You Make It Ahead?
Yes, and I nearly always do, because butternut squash casserole is one of those dishes that waits patiently. Spread the filling in the dish, cover it and refrigerate for up to 24 hours. Keep the crumble in a separate container in the fridge, because it stays crisp only if it goes on just before baking. On the day, scatter the topping over and bake as usual, adding 5 to 10 minutes since the dish starts cold.
Storage and Reheating
- Fridge. Cover leftover butternut squash casserole and keep it in the fridge for 3 to 4 days.
- Reheat. Warm it, covered with foil, in a 350°F (180°C) oven for 15 to 20 minutes. Uncover for the last few minutes so the crumble crisps again. The microwave works for single portions, although the topping softens.
- Freezer. Freeze the baked and cooled dish, well wrapped, for up to 3 months. Thaw it overnight in the fridge before reheating.
Variations and Substitutions
- Marshmallow top. Scatter mini marshmallows over the crumble for the last 5 minutes of baking.
- Different nuts. Walnuts are a straight swap. Cleveland Clinic notes that pecans are especially rich in manganese and vitamin E, so I usually stay loyal to them.
- Nut free. Replace the pecans with rolled oats for crunch.
- Less sweet. Drop the sugar in the filling to 1/3 cup; the crumble will carry the sweetness.
- Warmer spice. Add a pinch of nutmeg or ginger alongside the cinnamon.
- Other squash. Kabocha or sugar pumpkin can stand in, as can sweet potato.
What to Serve With Butternut Squash Casserole
This is a holiday side at heart, so it belongs next to a golden roast turkey or a sticky honey glazed ham. For balance, I like something green and something savoury alongside, such as my fresh green bean casserole and a dish of herby bread stuffing.
It is just as welcome on an ordinary Sunday with a simple roast chicken or pork chops. And if you bought a big bag of pecans, the rest can go into an easy pecan pie for afters.
Frequently Asked Questions
Ingredients and Method
Do I have to peel butternut squash for this casserole?
For boiling, yes, because the skin stays tough. If peeling feels like too much work, halve and roast the squash instead, then scoop the soft flesh out of the skin.
Can I use frozen or pre-cut squash in this casserole?
Yes. Pre-cut fresh cubes behave exactly like home-cut ones; you need 3 pounds (1.4 kg). Frozen cubes hold more water, so cook them from frozen until tender, drain very well and let them steam dry before mashing.
Can I use canned squash or pumpkin puree instead of fresh butternut squash?
It will work in a pinch, although the flavour is flatter. Use it in place of the mashed squash, and simmer it for a few minutes first to drive off some moisture.
What size dish do you need for butternut squash casserole?
A 2-quart baking dish. An 8 x 11 inch or a deep 9 inch square dish holds that amount comfortably.
Serving and Storing
Is butternut squash casserole a side dish or a dessert?
A side dish. It is served with the main meal, next to roast turkey or ham. However, it is sweet enough that a warm spoonful with vanilla ice cream would not be out of place.
Can I double this squash casserole recipe?
Yes. Use a 9 x 13 inch dish and allow roughly 10 extra minutes in the oven, checking that the centre has set.
How do I keep the pecan crumble topping crisp?
Use butter straight from the fridge, add the crumble just before baking and reheat leftovers in a 350°F (180°C) oven, uncovering for the last few minutes, instead of the microwave.
How long does butternut squash casserole last?
3 to 4 days covered in the fridge, or up to 3 months in the freezer, well wrapped. Refrigerate it within 2 hours of baking, thaw frozen casserole overnight in the fridge and reheat under foil at 350°F (180°C) for 15 to 20 minutes.
How many calories are in butternut squash casserole?
About 380 calories per serving when split into 8 portions, with roughly 54 g carbohydrates, 30 g sugar, 5 g protein and 18 g fat. These figures are estimates and vary with the butter, sugar and milk you use.
Ingredients
Squash Filling
- 3 pounds butternut squash (1.4 kg), peeled and cubed
- 4 tablespoons butter melted
- 2 large eggs beaten
- 1/2 cup brown sugar
- 1/4 cup milk (60 ml)
- 1 teaspoon vanilla extract
- 1/2 teaspoon cinnamon
- 1/2 teaspoon salt
Topping
- 1/2 cup all-purpose flour
- 1/2 cup brown sugar
- 4 tablespoons cold butter cubed
- 1/2 cup chopped pecans
Instructions
- Heat the oven to 350°F (180°C) and grease a 2-quart baking dish.
- Put the cubed squash in a large pot, cover with water and bring to a boil. Cook for 15 to 20 minutes until very tender, then drain well.
- Mash the squash until smooth. Stir in the melted butter, eggs, brown sugar, milk, vanilla, cinnamon and salt until combined.
- Spread the squash mixture evenly in the prepared dish.
- For the topping, mix the flour and brown sugar in a medium bowl. Cut in the cold butter with a fork or pastry cutter until crumbly, then stir in the pecans.
- Scatter the topping evenly over the squash.
- Bake for 30 to 35 minutes, until the topping is golden brown and the casserole is set.
- Let it stand for 10 minutes before serving.
