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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 minutes
COOK: 30 minutes
TOTAL: 45 minutes
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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44 thoughts on “Yellow Squash Casserole”

  1. I’ve made this numerous times since finding the recipe because it’s squash season. I’m not the best cook but no matter how many tweaks I make to the recipe, it turns out delicious every time. I’ve added zucchini, added a little bit of fresh grated Parmesan cheese- in addition to the shredded cheddar and different seasonings. Last time, I omitted the milk, lessened the amount of sour cream a bit and used cottage cheese. I added the mayonnaise per the recipe and it turned out great.

  2. Marcy Sherwood

    Picked a bounty of zucchini and various pepper varieties in the morning and sliced them up and followed this recipe. I subbed crushed pork rinds for the crackers to keep the carbs down. It came out absolutely delicious!

  3. This is so easy to make! The taste will take back to grandma’s with family all around eating, laughing and good food.

  4. Kevin Kneeland

    Off the chain casserole !! Easy to prepare and cook,definitely a great way to use up squash that have to be picked every day !! Delicious !!

  5. This will be my second time making it the first time it was a hit it was last year Christmas dinner and today is my Family reunion and there is going to be a lot more people there I hope everyone will enjoy it

  6. Wow! This squash casserole recipe is absolutely DELICIOUS!
    I grow a tropical type of squash called: Snake Gourd (Naga, Python Gourd, Doodhi, etc). Since I didn’t have any yellow squash on hand, I used my snake gourd instead and it turned out so tasty.
    I’m thinking that this recipe would work well with Tromboncino squash or a zucchini squash variety.
    Many thanks for sharing your recipe! 🙂

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