If you’re looking for a cozy dinner that feels a little fancy without being too complicated, this butternut squash lasagna deserves a spot on your menu. It layers sweet, roasted butternut squash with tender lasagna noodles, creamy brown butter sage béchamel, and plenty of melted cheese for a dish that’s rich, comforting, and full of autumn flavor.
The real magic is in the sauce. Brown butter adds a warm, nutty aroma, while fresh sage brings an earthy, slightly peppery note that pairs beautifully with the natural sweetness of the squash. Instead of the usual tomato-based filling, this lasagna has a silky white sauce that makes every bite taste like something you’d order at a cozy Italian restaurant.
Serve it for a family dinner, a holiday gathering, or a relaxed weekend meal when you want comfort food with a little extra personality.
Butternut Squash Lasagna With Brown Butter Sage Béchamel
Ingredients
For the Roasted Butternut Squash
- 1 medium butternut squash about 2 pounds (900 g), peeled, seeded, and cubed
- 2 tablespoons olive oil
- ½ teaspoon salt
- ¼ teaspoon freshly ground black pepper
- ½ teaspoon garlic powder
- ¼ teaspoon ground nutmeg
For the Brown Butter Sage Béchamel
- 6 tablespoons unsalted butter
- 10 –12 fresh sage leaves plus extra for garnish
- ¼ cup all-purpose flour
- 3 cups whole milk warmed
- ½ teaspoon salt or to taste
- ¼ teaspoon black pepper
- ¼ teaspoon ground nutmeg
- ½ cup finely grated Parmesan cheese
For Assembling the Lasagna
- 9 –12 lasagna noodles depending on your baking dish
- 2 cups shredded mozzarella cheese
- 1 cup ricotta cheese
- ½ cup grated Parmesan cheese
- 1 tablespoon olive oil or butter for greasing the baking dish
Instructions
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Preheat your oven to 400°F (200°C). Line a large baking sheet with parchment paper.
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Place the cubed butternut squash on the baking sheet. Drizzle with olive oil, then sprinkle with salt, black pepper, garlic powder, and nutmeg. Toss until the pieces are evenly coated, then spread them in a single layer.
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Roast for 25–30 minutes, turning the squash halfway through, until it's tender and lightly caramelized around the edges.
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Let the squash cool slightly. Mash roughly with a fork or potato masher, leaving a few small chunks for texture. You want a thick, spoonable filling rather than a completely smooth puree.
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While the squash roasts, bring a large pot of salted water to a boil. Cook the lasagna noodles according to the package instructions until just shy of al dente, since they'll continue cooking in the oven.
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Drain the noodles carefully and lay them flat on a lightly oiled baking sheet or clean surface to prevent sticking.
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If you're using oven-ready noodles, follow the package directions and make sure your béchamel isn't too thick to provide enough moisture during baking.
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In a medium saucepan over medium heat, melt the butter. Continue cooking, swirling the pan occasionally, until the butter foams and its milk solids turn golden brown. You'll notice a delicious nutty aroma, usually after about 3–5 minutes.
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Add the fresh sage leaves carefully and let them sizzle briefly until fragrant. Remove the leaves with a slotted spoon and set them aside for layering or garnish.
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Reduce the heat to medium-low and whisk the flour into the browned butter. Cook for about 1–2 minutes, stirring constantly, until a smooth paste forms and the raw flour smell disappears.
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Gradually pour in the warm milk, whisking continuously to prevent lumps. Simmer gently for 5–8 minutes, stirring often, until the sauce thickens enough to coat the back of a spoon.
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Stir in the salt, black pepper, nutmeg, and ½ cup Parmesan cheese. Taste and adjust the seasoning. The finished béchamel should be creamy and pourable, not stiff.
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Helpful tip: Keep a close eye on the butter as it browns. The difference between nutty golden butter and burnt butter can be just a few seconds.
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In a small bowl, combine the ricotta cheese with about ¼ cup of the shredded mozzarella. Mix until evenly combined. This creamy mixture adds a soft, cheesy layer that balances the sweetness of the squash and the richness of the sauce.
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Reduce the oven temperature to 375°F (190°C). Lightly grease a 9-by-13-inch baking dish. Spread a thin layer of béchamel across the bottom of the dish. Add a layer of lasagna noodles, overlapping them slightly if needed.
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Spread about one-third of the roasted squash over the noodles, followed by small spoonfuls of the ricotta mixture. Drizzle with béchamel, then sprinkle with mozzarella and a little Parmesan.
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Repeat the layers until the ingredients are used, finishing with lasagna noodles covered generously with the remaining béchamel and the rest of the mozzarella and Parmesan.
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Arrange the reserved fried sage leaves over the top if desired. Make sure the edges of the noodles are covered with sauce to help prevent them from drying out.
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Cover the baking dish loosely with foil, making sure it doesn't press against the cheese. Bake for 25 minutes. Remove the foil and continue baking for another 15–20 minutes, until the top is golden, the sauce bubbles around the edges, and the noodles are tender.
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If you'd like a deeper golden crust, broil for 1–2 minutes at the end, watching closely to prevent burning.
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Remove the lasagna from the oven and let it rest for 15 minutes before slicing. This gives the creamy layers time to settle, making it much easier to serve neat portions.
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Garnish with extra Parmesan, a few fresh sage leaves, and freshly cracked black pepper. Serve warm and enjoy every creamy, nutty, cheesy bite.
Tips for the Best Butternut Squash Lasagna
Roast instead of boiling the squash. Roasting concentrates the squash’s natural sweetness and removes excess moisture, helping keep the lasagna from becoming watery.
Brown the butter patiently. Look for golden-brown flecks and a toasted, nutty smell. Remove the pan from the heat as soon as the butter reaches that stage.
Use freshly grated Parmesan. It melts more smoothly into the béchamel and gives the sauce a fuller, more savory flavor.
Don’t make the sauce too thick. The béchamel should be creamy and easy to spread. It will thicken further as the lasagna bakes.
Allow enough resting time. Cutting into the lasagna immediately can cause the layers to slide apart. A short rest makes serving much easier.
What to Serve With Butternut Squash Lasagna
Because this lasagna is rich and creamy, it pairs especially well with fresh, crisp sides. Try a simple arugula salad with lemon vinaigrette, roasted green beans, sautéed broccoli, or garlic bread for a satisfying dinner.
For a lighter meal, serve it with steamed vegetables or a cucumber and lettuce salad. A little acidity from lemon juice or a tangy dressing helps balance the nutty butter and creamy cheese.
Variations to Try
- Add spinach: Fold sautéed spinach into the ricotta mixture for extra color and flavor. Squeeze out excess moisture first.
- Make it extra cheesy: Add a little Gruyère or fontina for a richer, more savory finish.
- Include toasted walnuts: Sprinkle chopped toasted walnuts between layers for a pleasant crunch.
- Add mushrooms: Sauté sliced mushrooms until browned and layer them with the squash for a deeper, earthier flavor.
- Make it vegetarian-friendly: Check that your Parmesan uses vegetarian-friendly enzymes if that matters to your diet.
Storage and Reheating
Refrigeration: Allow leftovers to cool, then store them in an airtight container in the refrigerator for up to 3–4 days.
Freezing: Freeze individual portions in freezer-safe containers for up to 2–3 months for best quality. Thaw overnight in the refrigerator before reheating.
Reheating: Cover a portion with foil and warm it in a 350°F (175°C) oven until heated through, usually 15–25 minutes depending on its size. Add a spoonful of milk or béchamel if the lasagna seems dry. Individual portions can also be reheated in the microwave in short intervals.
For make-ahead preparation, roast the squash and prepare the béchamel a day in advance. Refrigerate them separately, then assemble and bake when you’re ready. If assembling the entire lasagna ahead of time, keep it covered in the refrigerator and allow extra baking time if it’s still cold when it goes into the oven.
A Cozy Dinner Worth Making Again
Butternut squash lasagna with brown butter sage béchamel brings together everything we love about comfort food: tender pasta, creamy cheese, sweet roasted vegetables, and a fragrant sauce that makes the whole kitchen smell wonderful. It takes a little time to build the layers, but most of the work is straightforward, and the result feels special enough for guests while remaining comforting enough for an ordinary weeknight.
Serve it fresh from the oven, let everyone dig in, and don’t be surprised if this becomes one of your favorite cool-weather dinners.
