This invisible butternut squash, spinach and mushroom lasagna will melt in your mouth. It is delicious, cheesy and no pasta is required to make it!
This invisible butternut squash, spinach and mushroom lasagna reimagines a classic French dish without any pasta. Instead of sheets of dough, the layers are built with thinly sliced butternut squash, which are so delicate they almost melt into the creamy filling as the dish bakes.

The filling is where the magic truly happens, blending savory and earthy notes with rich creaminess. A decadent mix of sautéed spinach and mushrooms is swirled with a generous amount of Boursin cheese.

Once pulled from the oven, this no pasta creation is a golden, bubbling masterpiece that completely transcends traditional lasagna. It’s a satisfying, vegetable forward dish that feels both lighter and more luxurious than its pasta heavy counterpart.

This invisible butternut squash, mushroom and spinach lasagna is a French style recipe inspired by my Invisible Apple Cake. Same method but different ingredients. If you like this recipe, you will also love my No Pasta Butternut Squash Lasagna or my Cheesy Butternut Squash Fritters.

Thank you for stopping by Hungry Happens! If you create this dish or any other from our site, we would greatly appreciate you taking the time to comment and rate the recipe! LOVE YOUR LIFE!

Invisible Butternut Squash, Spinach + Mushroom Lasagna
Ingredients
- 2 tbs olive oil
- 5 oz (141.75 g) baby spinach, rough chop
- 20 oz (560 g) baby bella mushrooms, sliced
- 1½ lbs (0.68 kg) butternut squash
- 5 oz (141.75 g) Boursin cheese, room temp
- 2 eggs
- 1/3 cup (78.86 ml) milk
- 1/3 cup (41.67 g) flour
- 1 tsp baking powder
- 1/2 tsp each salt, garlic powder + onion powder
- 1/8 tsp ground nutmeg
- 3 tbs parsley, minced
- 1 cup (112 g) shredded mozzarella cheese
- 2 tbs grated parmesan cheese
Instructions
- Preheat oven to 400℉. Spray your 9×13 inch baking dish with olive oil.
- Heat 1 teaspoon olive oil in a large skillet over medium heat. Add in the spinach and sauté for 1-2 minutes – until just wilted. Transfer to a plate and set aside. Next, heat the remaining olive oil in the same skillet and sauté the mushrooms for 4-5 minutes. Transfer to the plate and set aside.
- Peel, halve lengthwise and deseed the butternut squash. Using a hand held mandoline slice it about 1/8 to 1/4 inch thick pieces.
- In an extra large bowl, add in the Boursin, eggs, milk and whisk together until smooth. Next, add in the flour, baking powder, salt, garlic powder, onion powder, nutmeg and mix until incorporated. Then, fold in the parsley, spinach, mushrooms and butternut squash to coat all with the mixture. Transfer mixture to the baking dish and spread out evenly and flatly. Top with mozzarella and parmesan. Bake for 40-45 minutes or until golden brown on top.
Notes
- Store leftovers in an airtight container in the fridge, up to 3-4 days.
- You can use sweet potato instead of butternut squash.
- You can use kale instead of baby spinach.
- In place of Boursin cheese, you can use goat cheese or softened cream cheese.
- Make this GLUTEN FREE, by using gluten free all purpose flour.
Which flavor Boursin cheese?
HI Ashley, I used caramelized onion Boursin but you can use any flavor
I am in love with this recipe! I did a couple things differently. I added dollops of ricotta in-between “layers” and some provolone pieces here and there, afterall, it is lasagna. Only a small mandoline mishap!
I’d highly recommend this recipe. It is labor intensive but definitely worth the effort. I’ll have many meals with this dish as I plan to freeze dinner sized portions.
HI Marianne, sounds delicious! Thanks for the kind review!
Hi,
Can the lasagna be frozen?
Thanks!
Yes!
Could you use vegan cheese and milk?
Hi Ali – yes you can!
This sounds great, but how is it gluten-free when the recipe calls for flour?
HI Mike, I give GF option in the NOTES section of the recipe
Hi, there’s a large discrepancy in the metric and US measurement for the mushrooms. Can you please check and let us know which one is correct? 20 ounces of mushrooms is almost 600grams. yet on the metric side, the recipe says just shy of 200 grams. I made it tonight and went for the lower amount. It was delicious, though I think it could do with double the spices.
HI Liesel, its the larger amount of around 550 grams of mushrooms. I love a lot of mushrooms! Thanks for bringing that to my attention!
How can we make this Gluten-free?
Hi Robin – can absolutely be made GF by using Gluten Free all purpose flour
Do you know if I could use the same recipe for a crockpot?
You have baking powder in the ingredients list but in the instructions you have baking soda. Which is it? I am excited to make it tonight with a pork tenderloin. Sounds delicious!!
Its baking powder.. I updated it yesterday! Enjoy the rcipe!
Why not answer the reply asking about the discrepancy regarding baking soda or powder? Skipped right over that one…
Can you freeze it?
Yes!
very good easy to put together recipe. I just hate when I do it and it never looks like the picture LOL but regardless I wouldn’t mind doing it again. thanks for sharing a delicious recipe
HI Venus, I’m so glad you enjooyed it!
The recipe states baking powder but the directions say baking soda. Which one is it?
Mia – did you figure it out??
I have the same question. The ingredients link where it says baking powder, even leads you to a page for baking soda! Very confusing
Sorry about this, its baking powder! Always go by what’s in the ingredient list
HI Mia, sorry for the mistake – it is baking powder. We have updated the recipe insstructions.
I ended up using baking soda but don’t think there was any negative impact. Turned out great. I added caramelized leeks as I needed to use them up and that was a bonus flavor! Will make again and maybe add a pinch of crushed red pepper, too 😉
Did we find out if it is baking powder or soda?
Its baking powder! The recipe has been updated!
Can this be made in advance, either 1-2 days, or frozen? Maybe assemble & fridge/freeze, or cook partway?
I’m excited to make this as a thanksgiving dish . I want to make it ahead. I’m assuming I can assemble uncooked and freeze and thaw in fridge night before and cook then regular instructions?
Any particular kind of Boursin? Flavour?
I LOVE caramelized onion but any flavor will work!
it will be powder
Love this recipe!!💗💕💗
THANK YOU GLORIA!