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This Butternut Squash Lasagna recipe is a cozy and heartwarming vegetarian meal, made with a creamy roasted butternut squash sauce, no-boil noodles, mushrooms, spinach, ricotta, and crispy sage. Video + Vegan-adaptable.

Butternut Squash Lasagna Recipe

5 Stars 4 Stars 3 Stars 2 Stars 1 Star 4.9 from 132 reviews
  • Author: Sylvia Fountaine | Feasting at Home
  • Prep Time: 60 mins
  • Cook Time: 60 minutes
  • Total Time: 2 hours
  • Yield: 9 1x
  • Category: vegetarian, main, dinner idea, vegetarian dinnser
  • Method: Baked
  • Cuisine: American
  • Diet: Vegetarian


This Butternut Squash Lasagna is a delicious vegetarian meal, perfect for fall. Made with mushrooms, spinach, sage, and easy, no-boil noodles. Vegan adaptable. Video.


Units Scale

 Creamy Butternut Squash Sauce:

  • 1 medium butternut squash (2 1/2 lbs- 3 lbs), about 3 cups, cooked
  • 1/2 a sweet onion, sliced into big wedges
  • olive oil for drizzling
  • 1/21 cup water or veggie broth
  • 3 tablespoons olive oil
  • 1 1/4 teaspoon salt
  • 1/2 teaspoon pepper
  • 1/2 teaspoon garlic powder

Mushroom Spinach Filling:

  • 2 tablespoons olive oil or butter
  • 1 1/2 lb mushrooms, sliced (cremini, button, shiitake, portobello, wild mushrooms, etc.)
  • 1 fat shallot or 1/2 onion, diced
  • 4 garlic cloves, rough chopped
  • 2 tablespoons fresh chopped sage ( or sub thyme, or rosemary)
  • 1/2 teaspoon salt
  • optional – 2-3 handfuls of baby spinach or other greens, to wilt.

Ricotta Mixture:


  • 1 1 /2 cups grated mozzarella cheese ( about 34 ounces) or sub vegan “meltable” cheese
  • 1/2 cup pecorino cheese or parmesan ( about 1 ounce) or sub vegan
  • No-boil lasagna noodles (uncooked) – or use regular boiled lasagna noodles cooked to al dente. ( you’ll need enough for 3 layers)
  • Optional: Crispy sage leaves ( see notes) or Arugula Pesto

Optional Quick Béchamel Sauce:

  • 1 1/2 tablespoons olive oil (or butter)
  • 1 1/2 tablespoons flour
  • 1 cup milk (or nut milk)
  • generous pinch salt, pepper and nutmeg
  • remaining 1/2 cup mozzarella and 2 tablespoons parmesan (or meltable vegan cheese )


  1. Make the Butternut Squash Sauce. Preheat oven to 425 F. Cut butternut squash in half, scoop out the seeds and place them open-side down on a parchment-lined baking sheet. Place the onion ( cut into large wedges) next to it and drizzle it with a bit of olive oil. Roast until fork-tender, about 30-40 minutes. Let cool. You could do this a day before or cook whole in an instant pot for 22 minutes. When the butternut is cool enough to handle, scoop out 3 -3 ½ cups of the flesh into a food processor.  Add the roasted onion, olive oil, water, salt, pepper and garlic powder. Puree until very smooth. TIP: When using no-boil noodles, you want this to be extra loose & saucy, like a marinara sauce (so add more water if need be!). It should pour out of the food processor and you’ll need at least 4 cups of sauce.  This can be made up to 4 days ahead.
  2. Make the mushroom filling. In a large skillet, heat the oil or butter. Add mushrooms and shallots and salt, and saute over medium heat, until the mushrooms release their liquid and begin to brown. Add the garlic, sage and pepper.  Cook until garlic is fragrant, about 2-3 more minutes, and turn the heat off. You could toss in some spinach at the end and wilt for extra nutrients. Taste and make sure the filling has enough salt and pepper. You could also add a little truffle oil to elevate. Make this up to 3 days ahead and refrigerate.
  3. Ricotta Mixture: Using a fork, mix the ricotta cheese with the egg, nutmeg and salt. ( You really don’t need to add the egg, but it adds a lovely richness.)
  4. Lower oven to 375F
  5. Assemble the lasagna. In a greased 9 x 13-inch baking dish, add 1 cup of the butternut puree and spread out into a thin layer. Top with the first layer of lasagna noodles. Add half of the ricotta mixture and spread out evenly. Top with half of the cooked mushrooms/spinach. Sprinkle with 1/2 cup of the grated mozzarella and 2-3 tablespoons of pecorino cheese. Add the 2nd layer of lasagna noodles. Drizzle with 1 cup of butternut sauce; spread out the remaining ricotta mixture as evenly as possible. Add the remaining mushrooms and all the good bits (onions and sage) and sprinkle with ½ cup shredded mozzarella and 2-3 tablespoons pecorino cheese. Place the 3rd, final layer of noodles over the top. Lather with the remaining butternut Sauce and either sprinkle with the rest of the cheese or make the creamy béchamel sauce, spreading it over top. (See notes.). 
  6. Cover with parchment, then wrap tightly with foil and bake in 375 F oven for 40 minutes.  You want a tight seal when using no-boil noodles. (You never want the foil to touch your food, especially something wet- the aluminum will leach into your food.) Uncover and continue baking 15-20 minutes until golden and bubbly. Let rest 10 minutes, cut into 9 servings.
  7. Garnish with optional crispy sage leaves.


Tip: when using no-boil noodles, be sure your butternut sauce is extra saucy ( it’s ok to add more water) so the noodles have more moisture to soak up. If using boiled noodles, cook only to al dente (don’t overcook). 

Optional Béchamel: Instead of sprinkling the remaining cheese on top (which is totally fine, especially if pressed for time) make a quick light béchamel sauce to pour over the final layer of butternut puree using the remaining cheese. This just gives it a creamier look and feel (compared to the look of melted, grated cheese). This is just a personal preference that makes it look more appealing (from my catering days).  Totally up to you. 😉

To make the bechamel: heat the oil or butter in a small pot over medium heat. Add the flour, and toast it for 1-2 minutes. Gradually whisk in the milk, whisking out any clumps and browned bits. Stir in salt, pepper and the cheese reserved for the final layer, stirring until melted and incorporated.

A great way to conquer this is to make the components in stages. Make the butternut puree one day, the filling the next  day (storing in the fridge) assembling the next day, baking the next etc. OR Feel free to make this all ahead (refrigerate) and bake before serving, remembering to pull it out of the fridge for at least one hour before baking to let it come to room temp, for even baking.

This can also be baked and frozen, or frozen unbaked. 

To make the crispy sage leaves, generously coat the bottom of a small skillet with  olive oil over medium heat. Place each leave ( leaving a little stem is cute) into the hot oil and fry each side, around 30 seconds, or until crisp. Place on a paper towel to blot. Do one tester first, to get the timing right. You want them crisp, but still green, not too brown.)


  • Serving Size: 1/9th
  • Calories: 363
  • Sugar: 5.3 g
  • Sodium: 663.8 mg
  • Fat: 16.9 g
  • Saturated Fat: 7.4 g
  • Carbohydrates: 37.4 g
  • Fiber: 5.4 g
  • Protein: 16.8 g
  • Cholesterol: 57.6 mg