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Baked Yellow Squash + Zucchini Parmesan

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Stop zucchini fatigue with this easy parmesan.

zucchini yellow squash mozzarella marinara ingredients for parmesan on marble with cutting board

When, exactly, did zucchini and yellow squash become summer’s most prolific vegetables? There is a lot of it around in July and August. So much, in fact, that some people sometimes get tired of it. But some people do not have this recipe. This summery, satisfying yellow squash and zucchini parmesan recipe will help enjoy summer squash in the best possible way.

raw swirl of zucchini and yellow squash in casserole with mozzarella and onion

I am always looking for something new to do with zucchini — in particular, zucchini recipes that work as a full meal. This baked yellow squash and zucchini parmesan may be vegetarian, but it still feels satisfying, even decadent.

It is also generously sized and easy to make. The hardest parts? Slicing a bunch of squash (easy) and waiting impatiently while the casserole bakes down to its melty, golden-brown goodness (harder).

cooked zucchini and yellow squash parmesan parmigiana in red casserole with breadcrumbs and cheese

Baked Yellow Squash and Zucchini Parmigiana Recipe Notes

  • How to layer the parmigiana. Start with a base of marinara. This light, simple tomato sauce gets topped with diced onions and the squash, and more marinara. Bake this until the zucchini and squash become fork tender. Finally, top everything with grated mozzarella cheese. This all bakes until the whole thing comes together in a melty, bubbly, golden casserole.
  • I recommend making a homemade marinara (use this recipe). But if you are not into making marinara and want to get right down to making the parmigiana, the only acceptable jarred brand is, in my opinion, Rao’s.
  • The squash will release a fair amount of liquid as it cooks. The bottom of the casserole may be a bit watery. Either let the dish cook a little longer, uncovered, or just scoop the squash with a slotted spoon. Alternatively: Serve the liquid with some good, crusty bread to soak it up.

Which Mozzarella to Use in the Parmesan

Do not use fresh mozzarella. You want the firmer, low-moisture pizza kind. Ideally, fresh-grated. Fresh-grated mozzarella is better than pre-grated. Pre-grated mozzarella usually has a thin coating of potato starch to prevent clumping. This powdery coat does not let the cheese melt as creamily.

portion of zucchini parmesan on wooden plate with basil

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cooked zucchini and yellow squash parmesan parmigiana in red casserole with breadcrumbs and cheese

Baked Yellow Squash and Zucchini Parmesan

A satisfying and fresh dinner casserole that layers all of summer's best vegetables.
Prep Time15 minutes
Cook Time1 hour 15 minutes
Course: Main Course, Side Dish
Cuisine: Italian
Keywords:: easy, summer recipes, summer squash, tomato, yellow squash, zucchini
Servings: 4 to 6 people


  • 4 to 5 medium summer squash, zucchini and yellow squash, sliced thin
  • 1/2 medium yellow onion, diced
  • 2 cups marinara
  • 1 1/2 cups shredded mozzarella
  • 1/3 cup breadcrumbs
  • 2 teaspoons kosher salt, plus more to taste
  • freshly-ground pepper
  • 4 tablespoons extra-virgin olive oil, divided
  • fresh pecorino-Romano or Parmigiano-Reggiano cheese, to serve


  • Preheat the oven to 375°F.
  • On medium heat, toast the breadcrumbs in a pan with 2 tablespoons of olive oil and a pinch of salt until golden-brown, stirring often. Set aside.
  • Trim the ends of the squash and slice thin, about 1/8" to 1/4" thick.
  • Toss the sliced zucchini with 2 teaspoons of kosher salt and let season and drain in a colander for five to 10 minutes.
  • Coat the bottom of a casserole pan or baking dish with 2 tablespoons of olive oil. Ladle one cup of marinara into baking dish and spread over the bottom. Scatter the diced onions over the marinara.
  • Without rinsing the summer squash, shingle in a circular pattern around the casserole. Bake, loosely tented with foil, for about 30 minutes, until fork tender.
  • Remove the foil. Top the zucchini and yellow squash with another cup of marinara. Top with the shredded mozzarella, then the breadcrumbs, a generous pinch of salt, and bake -- uncovered -- for an additional 30 minutes, until the squash is soft and everything is melted and bubbling. Let cool for 5 to 10 minutes before serving.


  • Shannon

    5 stars
    I made this with fresh summer squash from the farmer’s market, homemade breadcrumbs and vegan mozzarella cheese. I added some fresh basil to the topping, and used Rao’s tomato sauce and it was absolutely DELICIOUS! It was fresh, flavorful and a fantastic comfort food. A gem of a recipe especially during zucchini season! I will definitely make this again! Thank you!

    • Unpeeled

      Yea!! I am so glad that you enjoyed it! It’s one of my favorite summer recipes…I don’t know about you, but I’m always looking for ways to use all that zucchini. Thank you again for this great comment. Much appreciated.

  • 5 stars
    So delish, I absolutely love this dish. Definitely will make again. Thank you!!

    • Unpeeled

      Awesome! So glad you enjoyed it. I love that cheese and breadcrumb topping 🙂

  • Denise Sessler

    Any suggestions regarding the total weight of the squash (zucchini and/or yellow squash)? Planning to use our fresh-from-the-garden yellow squash and we pick it somewhat small. Would you guess 3 pounds total? I like the sound of this recipe but don’t want to throw off the balance by going way underweight with the veggies.

    • Unpeeled

      Hi, Denise! I apologize for the long vacation delay in responding to this. I am excited that you have fresh summer squash right in your garden to use. Yum. 3 pounds is about right; maybe err a little on the 2 1/2 pound side. Enjoy.

  • Jessica D

    5 stars
    My husband (who does not like zucchini) and I loved this!!! It was so easy snd delicious. This will definitely be in my side dish rotation.
    Thx Lisa for another yummy recipe!

  • Rachel P.

    5 stars
    Great flavor and love the breadcrumb topping.

  • Gabrielle

    5 stars

  • 5 stars
    This is so summery and tasty! Worked out very well.

  • Isabella P

    5 stars
    Satisfying and very tasty

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