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    You are here: Home » Meal Type » Side Dishes » Zucchini Casserole

    Zucchini Casserole

    August 3, 2021 By Danielle Esposti 4 Comments

    May contain affiliate links.See our Privacy Policy and disclosure.

    Go to Recipe
    Pinterest collage for a zucchini casserole with keto and gluten free options.
    Pinterest image for a zucchini casserole recipe.
    Pinterest image for a zucchini casserole with keto and gluten free options.
    Pinterest collage for a zucchini casserole recipe.

    Say it with me now: “Comfort food is not just for cooler weather!” A healthy riff on a classic, Zucchini Casserole makes the most of seasonal squash. Crispy on the outside, gooey on the inside, this baked dish balances buttery creaminess with bright herbs for a summer supper sensation!

    A silver serving spoon tucked into a zucchini casserole.
    Jump to:
    • How to Make Zucchini Casserole
    • Chef’s Tips!
    • Is it Watery?
    • Make it Your Way
    • Frequently asked questions
    • More Healthy Summer Sides: Comfort Food Edition
    • Recipe

    I don’t write a lot about the <<gestures widely>> current global news, because it *hopefully* has a shelf life and my blog *hopefully* doesn’t. But this past winter, after almost 10 months under lock and key, I knew I needed something to look forward to, so I started my summer reading early.

    Interestingly enough, my literary adventures centered around one region – New England. Let’s just call it what it is – I was devouring chick lit beach reads in the middle of a winter lockdown.

    I kept noticing, across books and genres, that there were some surprisingly evocative references to cuisine. And that it was talked about with the same passion and nostalgia that you’d expect to find in more, let’s call them, food-centric regions.

    Not that I ever assumed our countrymen to the north didn’t like food! Just that, you know, puritanical roots run deep and it’s always seemed a bit stoic to this particular outsider from New Jersey who now lives in the “south.” But no! Reader, I was wrong for days!

    I started digging and stumbled upon an absolute gem of a cookbook by Sarah Leah Chase – the New England Open House Cookbook – and have been going down an almost life-changing rabbit hole ever since. Not only do I have a fairly extensive (and probably too expensive) trip planned on paper, but I’m spending more time looking into my own regional food roots. Of course, I’ve also been paying homage in my own kitchen by trying her incredible recipes.

    This zucchini casserole recipe is inspired by her version of the classic casserole that frankly, I never knew existed. But I and my husband – who I literally had to chase off from the pan with a wooden spoon – are eternally grateful for her creativity, insight, and liberal use of salt and fat.

    Side view, a serving spoon filled with zucchini casserole hovering over a casserole dish.
    A serving of zucchini casserole in a grey bowl with a black serving spoon and striped linen napkin on the side.

    How to Make Zucchini Casserole

    Zucchini Casserole is a showstopper of a side dish that is worth every swirl of the skillet and minute in the oven on a hot summer day. Fresh summer zucchini and yellow squash get sauteed and baked into a comforting concoction with bright herbs, tangy tomatoes, gooey cheese, and buttery breadcrumbs. Be forewarned – consider making a double batch! Second and third helpings are a certainty.

    For a condensed post, click to view the web story for this recipe!

    Breadcrumbs mixed with melted butter in a white bowl with a silver spoon.
    Sauteed onions and garlic in a skillet.
    Side view, sautéed zucchini and squash with onions in a skillet.
    Side view, zucchini casserole vegetables sautéed in a skillet.
    A zucchini casserole topped with cheese and breadcrumbs before baking.
    A golden brown baked zucchini casserole fresh from the oven.
    1. PREP. Heat the oven to 350°F and grease a 9” x 13” casserole dish with olive oil spray or butter.
    2. MAKING TOPPING. Combine breadcrumbs and butter until the breadcrumbs are evenly moistened.
    3. ONIONS & GARLIC. Saute onions in butter until soft; add plenty of fresh garlic at the end and cook until fragrant.
    4. ZUCCHINI AND SQUASH. Add zucchini and squash to the pan. Cook until their liquids release and cook off completely, about 15 minutes.
    5. TOMATOES. Add diced tomatoes (including the canning liquid), then season. Simmer for 5 minutes to cook off any remaining liquid.
    6. LAYER CASSEROLE. Scrape vegetable mixture into the baking dish. Sprinkle with cheese, then add the breadcrumb topping.
    7. BAKE. Bake uncovered for 30 minutes, until golden and bubbling.
    8. GARNISH AND SERVE. Rest 5 minutes, then liberally garnish with fresh basil and serve.

    Chef’s Tips!

    • Thoroughly grease your baking dish. Olive oil will keep it healthier, but if you can spare the calories, butter absolutely makes it better.
    • Important: saute the zucchini and squash all the way through, until visible liquids have evaporated, at least 15 minutes. This will prevent your casserole from being watery.
    • Don’t be shy with your toppings or your cheese. This is a great recipe to make “your way” – suggestions below.

    Is it Watery?

    Nope! The water cooks out in the sautéing stage, as long as you cook long enough – 15 minutes minimum, depending on your squash.

    Side view, a silver serving spoon tucked into a zucchini casserole.

    Make it Your Way

    HERBS: Top with fresh herbs like basil, thyme, or parsley. The herbs really enhance the flavor.

    CHEESE: If you’re not a fan of sharp cheddar cheese, try mozzarella, smoked mozzarella, or medium cheddar. Feel free to substitute up to a quarter cup of one of these softer cheeses for shredded parmesan for more of a bite.

    MAKE IT GLUTEN FREE: use gluten free breadcrumbs.

    MAKE IT KETO/LOW CARB: substitute coarse almond meal for the panko breadcrumbs to make the crispy topping.

    Frequently asked questions

    How do I store leftovers?

    Store leftovers in a sealed container in the fridge for up to 2 days. Reheat at 350°F until warmed through. Don’t freeze.

    How to serve zucchini casserole?

    This dish can be served as a main course or a side dish, hot from the oven or warm/room temperature.

    More Healthy Summer Sides: Comfort Food Edition

    • Gluten Free Fried Green Tomatoes
    • Green Beans with Bacon and Garlic
    • Classic Italian Potato Salad
    • Broccoli Bacon Salad
    • Bacon Coleslaw
    Side view, a serving of zucchini casserole in a grey bowl with a black spoon.

    Did you make this zucchini casserole? I’d love to know how it turned out! Leave a comment and a rating below.

    While you’re at it, let’s be friends – follow me on Pinterest and Instagram for the latest and greatest.

    Recipe

    Side view, a serving of zucchini casserole in a grey bowl with a black spoon.

    Zucchini Casserole

    5 from 3 votes
    Author: Danielle Esposti
    Print Recipe Rate this Recipe Pin Recipe
    Zucchini Casserole is a showstopper of a side dish that is worth every swirl of the skillet and minute in the oven on a hot summer day. Fresh summer zucchini and yellow squash get sauteed and baked into a comforting concoction with bright herbs, tangy tomatoes, gooey cheese, and buttery breadcrumbs. Be forewarned – consider making a double batch! Second and third helpings are a certainty.
    Prep Time: 15 mins
    Cook Time: 1 hr
    Total Time: 1 hr 15 mins
    Servings : 8
    Calories: 192

    Recommended Equipment

    • 9×13 Casserole Dish
    • 12″ Skillet

    Ingredients

    • 6 tbsp butter, divided
    • 1 c panko breadcrumbs, or almond meal, see notes
    • 1 medium vidalia onion, diced to ½”
    • 3 clove garlic, minced
    • 3 medium zucchini, about 1.5 pound, diced into 1” pieces
    • 1 medium yellow squash, about ½ pound, diced into 1” pieces
    • 1 14-oz can diced tomatoes, fire roasted preferred
    • 1 tsp dried basil
    • ½ tsp dried thyme
    • 1¼ tsp kosher salt
    • ½ tsp ground pepper
    • 4 oz 1.5 cups sharp cheddar, shredded
    • fresh chopped basil, for garnish

    Instructions

    • Heat oven to 350°F. Mist a 9” x 13” casserole dish with olive oil cooking spray; alternatively rub with additional softened butter.
    • Melt 2 tbsp butter. Add the melted butter to the breadcrumbs and mix until the breadcrumbs are evenly moistened. Set aside.
    • Heat the remaining 4 tbsp butter in a 12” skillet over medium high heat until the butter melts then foams. Add the onion, toss to coat in the fat, and saute, stirring occasionally, until the onion softens, 6-7 minutes. Add the garlic and saute, stirring continuously, until fragrant, about 1 minute.
    • Add the zucchini and squash to the pan. Saute, stirring occasionally, until the zucchini and squash release their liquids, the liquid cooks off, and the vegetables are tender, about 15 minutes.
    • Add the diced tomatoes (including the canning liquid), basil, thyme, salt, and pepper. Stir to combine, then bring the liquid to a simmer; adjust the heat to maintain a steady simmer and cook for 5 minutes.
    • Scrape the mixture into the prepared casserole dish. Sprinkle the shredded cheese over the vegetable mixture, then sprinkle the breadcrumbs evenly over the casserole.
    • Transfer to the oven and bake for 30 minutes, until the cheese is melted, the topping is golden brown, and the casserole is bubbling. Rest five minutes, then garnish with fresh basil and serve hot or warm.

    Notes

    Make it Keto:  substitute coarse almond meal for the breadcrumbs. Cal = 242; Fat = 20g; Carb = 10g; Fiber = 3g; Protein = 8g

    Nutrition Information

    Calories: 192kcal (10%), Carbohydrates: 13g (4%), Protein: 6g (12%), Fat: 14g (22%), Saturated Fat: 8g (40%), Polyunsaturated Fat: 0g, Monounsaturated Fat: 3g, Trans Fat: 0g, Cholesterol: 38mg (13%), Sodium: 418mg (17%), Potassium: 319mg (9%), Fiber: 2g (8%), Sugar: 3g (3%), Vitamin A: 88% (88%), Vitamin C: 20% (20%), Calcium: 32% (32%), Iron: 2% (2%)
    Did you make this recipe?Mention @oursaltykitchen or tag #oursaltykitchen!
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    Disclaimer: This post and the recipe card may contain affiliate links, which means we receive a small commission (at no cost to you!) if you make a purchase using these links. Rest assured, we only endorse products we own and truly love!

    4 Comments
    Filed Under: Gluten Free, Grain Free, Keto, Side Dishes, Summer Recipes, Vegetarian

    Reader Interactions

    Comments

    1. Debbie Barlow

      August 09, 2021 at 11:36 am

      5 stars
      I have to admit that I was slightly skeptical about this recipe of first, being from the south and normally using a binder in a casserole such as eggs, cream of soups or sour cream or mayonnaise. However, I made according to the recipe with the exception of I used 1/2 stick of butter with Ritz cracker crumbs for the topping. It was simply delicious. My husband and I ate half the casserole for dinner. And we’ll have the other half tonight. It allowed the fresh taste of the vegetables to come through and wasn’t watery in the least. Thanks for posting this recipe. I will certainly be making again.

      Reply
    2. Cathy K.

      August 10, 2021 at 12:42 am

      5 stars
      It was very good, easy to make, and my mother and sister-in-law both asked me for the recipe twice!

      Reply
    3. Joann Leatherman

      September 10, 2021 at 3:59 pm

      5 stars
      mjleatherman@hotmail.com

      Reply

    Trackbacks

    1. Healthy Casserole Recipes to Ease the Kitchen Drudgery says:
      December 14, 2021 at 4:34 am

      […] Crunchy-Topped Zucchini by Our Salty Kitchen: This zucchini bake doesn’t shy away from a thick and buttery breadcrumb topping, and you know what—we love that! It features onion, yellow squash, and tomatoes with a creamy helping of cheese. […]

      Reply

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