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Yellow Squash Casserole

Yellow Squash Casserole is creamy and cheesy with a buttery and crispy Ritz cracker topping. It makes a delicious side dish and is perfect for using fresh summer squash.

Yellow Squash Casserole in white square baking dish.

Yellow Squash Casserole with lots of cheddar cheese and a buttery cracker crumb topping is one of my favorite casseroles to make during the summer months. It’s super creamy with tender slices of summer squash and onion. A combination of mayonnaise and sour cream gives it plenty of creamy flavor.

I love to serve it with fresh Corn on the Cob.

Serve Yellow Squash Casserole at a summer potluck or as a comforting side dish for a family meal. I love it with fried chicken. Actually, I think I love everything with fried chicken.  🙂

This recipe also makes a great holiday side. My som requests it every Thanksgiving and Christmas.

Yellow squash is plentiful at farmers markets in the south during the summer months and it is easily grown in a home garden so I tend to make this casserole frequently during the summer months. But a creamy casserole like this is also extremely comforting during the cooler months.

Yellow Squash Casserole in square baking dish.

Yellow Squash Casserole Recipe Tip

This casserole is really easy to make. You do want to precook the squash some because you don’t want it to be crunchy at all in the finished casserole. You can either slice it and saute it, steam it, or even microwave it until just tender.

Make Ahead and Storage Suggestions

This recipe can be prepared through Step 5 a day in advance and refrigerated. Leftovers can be stored in an airtight container in the refrigerator for 4 days.

Spoon scooping squash casserole out of baking dish.

More Southern Casseroles

Yellow Squash Casserole

Squash Casserole is creamy and cheesy with a buttery Ritz cracker topping.
PREP: 15 mins
COOK: 30 mins
TOTAL: 45 mins
SERVINGS: 6 servings


  • 4 medium yellow squash, ends trimmed and cut into 1/4-inch slices
  • 1 medium onion, sliced
  • salt and pepper
  • 1 egg, lightly beaten
  • 1/4 cup mayonnaise
  • 1/3 cup sour cream
  • 1/4 cup milk
  • 1 cup heaping shredded cheddar cheese
  • 24 Ritz crackers
  • 2 tablespoons butter, melted


  • Preheat oven to 350 degrees and lightly grease a casserole dish.
  • Steam squash and onion until just tender, about 5 to 7 minutes.
  • Season squash and onion with salt and pepper.
  • In a large bowl, whisk together egg, mayonnaise, sour cream, and milk.
  • Stir in cheese, squash and onion. Transfer mixture to casserole dish.
  • Crush crackers and scatter on top of squash. Drizzle with melted butter.
  • Bake for 30 minutes.


Calories: 280kcal
Author: Christin Mahrlig
Course: Side Dish
Cuisine: Southern
Keyword: Casserole, Thanksgiving

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Originally posted May 28, 2016.

Disclosure: This post contains affiliate links.

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34 thoughts on “Yellow Squash Casserole”

  1. Great recipe! Thanks for sharing. However, I noticed that you didn’t answer the question regarding if it can be frozen. We have tons of summer squash and I would love to freeze this dish and reheat come this winter. Yes??

    1. This is a very old recipe that I have been making for over 35 years. I freeze it and it works out good. I like to steam my squash and onions and freeze just them to use at a later date. I also add ground beef from time to time. I think I got it from the Better Homes and Gardens casserole cookbook. Great recipes in that book.

  2. Amazing way to make an otherwise bland veggie delish! Very tasty! SPICY SOUTHERN KITCHEN YOU ROCK IT!

  3. This sounds delicious! I have loads of fresh yummy yellow squash just waiting to be used in this recipe. Thanks

  4. Donna Wright Raley

    Best squash casserole recipe I’ve ever tried. My family scarfed this up! Excellent! Thank you!

  5. Caren Standing

    Excellent! That is the consensus of my group of friends. And they were right! Deee-licious! (I also included zucchini…)

  6. Caren Standing

    Excellent! That was the consensus of my group of friends. And they were right! Deee-licious!

  7. It’s my first attempt at a squash casserole too and I added butternut squash. I’m so happy it’s delicious because I was worried it was going to be a waste of food since I’m not the best cook

  8. I did something I usually don’t do. I followed the recipe and doubled it. Great recipe. Good texture. It was a hit!

  9. Edward Plattor

    I made it just as recipe called but I added a can of diced green chillies. It turned out great

    1. Christin Mahrlig

      Yum! I will have to add some green chillies the next time. Thanks for the suggestion!

  10. Excellent. I have never made a casserole EVER and this turned out great. My only changes were
    1. I used 2 cups of cheese
    2. Didn’t have any Ritz so I used a cheesy cracker
    3. I used 3 tlbs of butter
    Thank you so much 🙂

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