Squash Casserole is an easy, side dish that goes with any meal. Slices of tender zucchini and yellow summer squash meld with a crunchy breadcrumb topping for a satisfying side dish.

With the abundance of zukes overflowing the produce aisles and farmers market this time of year, you’ll want to make tasty squash or zucchini casserole again and again. It’s so simple to prepare, and it’s a terrific way to entice the kids and adults alike to eat their veggies!

Easy Squash Casserole in a white dish with a serving spoon

What is in a Squash Casserole?

Most squash casseroles I’ve seen contain eggs, bread crumbs and several other ingredients. I absolutely love fresh zucchini and squash from the garden so I wanted to create a casserole that really focussed on the squash itself. This simple recipe is all about the squash.

Ingredients for this fresh summer side include:

  • Casserole: zucchini and-or yellow squash, onion, parmesan, Italian seasonings, salt & pepper
  • Topping: butter, seasoned bread crumbs, cheddar cheese
  • Optional Add-Ins: red or green bell peppers, cheeses, garlic, tomatoes

You can add other ingredients as well, or substitute other cheeses according to your preference or what you have on hand.

Soft or Tender-Crisp

Zucchini squash casserole can be made to your preference as far as texture.

For a softer casserole slice the zucchini a bit thinner and when sauteeing in the frying pan, cook it a little bit longer so it’s tender-crisp but a bit on the softer side.

For tender-crisp squash keep the zucchini at 1/4″ thickness. Be sure you don’t overcook it.

Yellow squash and zucchini slices arranged on a cutting board and in a baking dish

How to Make Squash Casserole

To Prepare the Squash

  • Cut the squash into ¼ inch slices and thinly slice the onion.
  • For crisper squash cut it thicker, for softer squash cut it thinner.
  • To keep squash from getting watery, sauté in olive oil until slightly softened.

squash slices in a skillet with onions and peppers for easy squash casserole

  • Place squash and onions upright (standing on edge) in a casserole dish.
  • Prepare the topping (according to recipe below) and sprinkle over top.
  • Bake and enjoy.

Buttered bread crumbs cook quickly, so keep an eye on your casserole. If the crumbs appear to be in danger of burning before the rest of the casserole is finished cooking, cover with a loose tent of foil. This will ensure they stay crispy but will reflect much of the heat away from the top.

making easy squash casserole, before baking

Can It Be Reheated?

Zucchini squash casserole tastes best when served fresh from the oven but of course it can be reheated.

Store leftover squash casserole tightly covered in the refrigerator for up to four days. The breadcrumbs won’t be as crisp but the squash itself will still taste delicious!

To reheat bake until hot (or you can reheat in the microwave). Then turn on the broiler element and put the heated casserole below the broiler for a few minutes of cooking to re-crisp the bread crumbs. Better yet, make a fresh batch of crumbs and top the leftovers with these.

Serving Suggestions

Zucchini squash casserole pairs well with just about any meaty main dish. Serve it with roasted or grilled chicken, barbecued ribs or hamburgers. It also goes great with Salisbury steak or pork chops with mushroom gravy.

Summer Veggie Sides

Easy Squash Casserole in a white dish with a serving spoon
5 from 48 votes↑ Click stars to rate now!
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Easy Squash Casserole

Slices of tender zucchini and yellow squash meld with a crunchy breadcrumb topping for a dish so satisfying and filling that you can even serve it as an entrée.
Prep Time 20 minutes
Cook Time 30 minutes
Servings 8


  • 1 small onion sliced
  • 1 tablespoon butter
  • 1 tablespoon olive oil
  • ½ teaspoon Italian seasoning
  • 2 pounds squash yellow squash and zucchini
  • salt & pepper to taste
  • ¼ cup grated parmesan cheese
  • ¼ cup cheddar cheese
  • cup seasoned bread crumbs
  • 2 tablespoons butter


  • Preheat oven to 350°F.
  • Slice squash/zucchini into ¼" slices.
  • Cook onion in butter and oil until tender. Add squash, Italian seasoning, salt, and pepper. Cook 5-6 minutes or just until tender crisp.
  • Place squash and onions in a greased 2 qt casserole dish.
  • Combine breadcrumbs, cheeses, and melted butter in a small dish. Sprinkle over squash.
  • Bake 35-40 minutes or until squash is tender.


If crumbs start to brown too much, loosely tent with foil.
5 from 48 votes

Nutrition Information

Calories: 157 | Carbohydrates: 18g | Protein: 4g | Fat: 8g | Saturated Fat: 4g | Cholesterol: 18mg | Sodium: 179mg | Potassium: 431mg | Fiber: 3g | Sugar: 3g | Vitamin A: 12257IU | Vitamin C: 25mg | Calcium: 129mg | Iron: 1mg

Nutrition information provided is an estimate and will vary based on cooking methods and brands of ingredients used.

Course Main Course, Side Dish
Cuisine American

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taking a scoop of easy squash casserole from a white casserole dish

taking a scoop of Easy Squash Casserole

taking a scoop of Easy Squash Casserole, squash arranged in a casserole dish



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Holly is a wine and cheese lover, recipe creator, shopping enthusiast and self appointed foodie. Her greatest passion is creating in the kitchen and making deliciously comforting recipes for the everyday home cook!
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Recipe Rating


  1. SO good! I make this casserole regularly. But take my advice; if you want to serve it with dinner, don’t bake it until the last minute. Mine usually doesn’t make it to the dinner table. As soon as it comes out of the oven, everyone wants a “just a bite” and it’s gone before dinner is ready. :0)5 stars

  2. Rather than cook the squashes in with the onions, I used the airfryer to desiccate them slightly for 7 minutes at 400 F.
    When they cooled I sprinkled with Italian seasoning, salt, pepper and garlic powder.
    After tiled in the casserole and sprinkling the crumble,, I cooked for 35 minutes at 350 F.
    Just delicious. I added some tomato slices to roast in the empty spot in the casserole.5 stars

  3. This was absolutely delicious. I used half the amount of Parmesan because it’s not one of my favorite cheeses but it was still the best casserole I ever had.5 stars

  4. Amazing! Even my husband who is not a fan of squash liked it! I made it according to the instructions. I also added a sprinkle of red pepper flakes. It was great. Just curious, how would it come out if you just layered the squash rather than stand it upright?

    1. So glad your family enjoyed it!

      I think it’d come out just fine layered. I stack them upright mainly because it looks nice but you also get a little bit more crispy bits on the edges of each piece.

  5. I have made this recipe 3 times for my family so far and each time the pan has been cleaned out. All say they love this recipe even the small kiddos.5 stars

    1. Definitely! You can swap equal amounts but you might like to add a bit of seasoning (salt/pepper).